diff --git a/dist/purify.cjs.js b/dist/purify.cjs.js
index a2e3be6e..7b07b1c6 100644
--- a/dist/purify.cjs.js
+++ b/dist/purify.cjs.js
@@ -540,7 +540,7 @@ function createDOMPurify() {
       body.outerHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML(dirty) : dirty;
     }
 
-    if (leadingWhitespace) {
+    if (dirty && leadingWhitespace) {
       doc.body.insertBefore(document.createTextNode(leadingWhitespace), doc.body.childNodes[0] || null);
     }
 
diff --git a/dist/purify.cjs.js.map b/dist/purify.cjs.js.map
index 2bcf2b9a..4e02cf5f 100644
--- a/dist/purify.cjs.js.map
+++ b/dist/purify.cjs.js.map
@@ -1 +1 @@
-{"version":3,"file":"purify.cjs.js","sources":["../src/tags.js","../src/attrs.js","../src/utils.js","../src/regexp.js","../src/purify.js"],"sourcesContent":["const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line no-control-regex\n);\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. 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\ No newline at end of file
+{"version":3,"file":"purify.cjs.js","sources":["../src/tags.js","../src/attrs.js","../src/utils.js","../src/regexp.js","../src/purify.js"],"sourcesContent":["const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line no-control-regex\n);\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (dirty && leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to 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\ No newline at end of file
diff --git a/dist/purify.es.js b/dist/purify.es.js
index 9ba575d0..d17b1227 100644
--- a/dist/purify.es.js
+++ b/dist/purify.es.js
@@ -538,7 +538,7 @@ function createDOMPurify() {
       body.outerHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML(dirty) : dirty;
     }
 
-    if (leadingWhitespace) {
+    if (dirty && leadingWhitespace) {
       doc.body.insertBefore(document.createTextNode(leadingWhitespace), doc.body.childNodes[0] || null);
     }
 
diff --git a/dist/purify.es.js.map b/dist/purify.es.js.map
index 3ecffce2..ff927edf 100644
--- a/dist/purify.es.js.map
+++ b/dist/purify.es.js.map
@@ -1 +1 @@
-{"version":3,"file":"purify.es.js","sources":["../src/tags.js","../src/attrs.js","../src/utils.js","../src/regexp.js","../src/purify.js"],"sourcesContent":["const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line no-control-regex\n);\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to 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\ No newline at end of file
+{"version":3,"file":"purify.es.js","sources":["../src/tags.js","../src/attrs.js","../src/utils.js","../src/regexp.js","../src/purify.js"],"sourcesContent":["const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line no-control-regex\n);\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (dirty && leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to 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\ No newline at end of file
diff --git a/dist/purify.js b/dist/purify.js
index cb032806..0dc5b2cf 100644
--- a/dist/purify.js
+++ b/dist/purify.js
@@ -544,7 +544,7 @@ function createDOMPurify() {
       body.outerHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML(dirty) : dirty;
     }
 
-    if (leadingWhitespace) {
+    if (dirty && leadingWhitespace) {
       doc.body.insertBefore(document.createTextNode(leadingWhitespace), doc.body.childNodes[0] || null);
     }
 
diff --git a/dist/purify.js.map b/dist/purify.js.map
index a28aafdd..0403dbcf 100644
--- a/dist/purify.js.map
+++ b/dist/purify.js.map
@@ -1 +1 @@
-{"version":3,"file":"purify.js","sources":["../src/tags.js","../src/attrs.js","../src/utils.js","../src/regexp.js","../src/purify.js"],"sourcesContent":["const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line no-control-regex\n);\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to 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\ No newline at end of file
+{"version":3,"file":"purify.js","sources":["../src/tags.js","../src/attrs.js","../src/utils.js","../src/regexp.js","../src/purify.js"],"sourcesContent":["const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line no-control-regex\n);\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (dirty && leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to 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diff --git a/dist/purify.min.js b/dist/purify.min.js
index 64650371..1e3fe8cf 100644
--- a/dist/purify.min.js
+++ b/dist/purify.min.js
@@ -1,2 +1,2 @@
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diff --git a/dist/purify.min.js.map b/dist/purify.min.js.map
index 1a274a28..76c37d2c 100644
--- a/dist/purify.min.js.map
+++ b/dist/purify.min.js.map
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If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to remove\n   */\n  DOMPurify.removeHook = function(entryPoint) {\n    if (hooks[entryPoint]) {\n      hooks[entryPoint].pop();\n    }\n  };\n\n  /**\n   * RemoveHooks\n   * Public method to remove all DOMPurify hooks at a given entryPoint\n   *\n   * @param  {String} entryPoint entry point for the hooks to remove\n   */\n  DOMPurify.removeHooks = function(entryPoint) {\n    if (hooks[entryPoint]) {\n      hooks[entryPoint] = [];\n    }\n  };\n\n  /**\n   * RemoveAllHooks\n   * Public method to remove all DOMPurify hooks\n   *\n   */\n  DOMPurify.removeAllHooks = function() {\n    hooks = {};\n  };\n\n  return DOMPurify;\n}\n\nexport default createDOMPurify();\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  'spreadmethod',\n  'stddeviation',\n  'stitchtiles',\n  'stop-color',\n  'stop-opacity',\n  'stroke-dasharray',\n  'stroke-dashoffset',\n  'stroke-linecap',\n  'stroke-linejoin',\n  'stroke-miterlimit',\n  'stroke-opacity',\n  'stroke',\n  'stroke-width',\n  'style',\n  'surfacescale',\n  'tabindex',\n  'targetx',\n  'targety',\n  'transform',\n  'text-anchor',\n  'text-decoration',\n  'text-rendering',\n  'textlength',\n  'type',\n  'u1',\n  'u2',\n  'unicode',\n  'values',\n  'viewbox',\n  'visibility',\n  'version',\n  'vert-adv-y',\n  'vert-origin-x',\n  'vert-origin-y',\n  'width',\n  'word-spacing',\n  'wrap',\n  'writing-mode',\n  'xchannelselector',\n  'ychannelselector',\n  'x',\n  'x1',\n  'x2',\n  'xmlns',\n  'y',\n  'y1',\n  'y2',\n  'z',\n  'zoomandpan',\n]);\n\nexport const mathMl = freeze([\n  'accent',\n  'accentunder',\n  'align',\n  'bevelled',\n  'close',\n  'columnsalign',\n  'columnlines',\n  'columnspan',\n  'denomalign',\n  'depth',\n  'dir',\n  'display',\n  'displaystyle',\n  'encoding',\n  'fence',\n  'frame',\n  'height',\n  'href',\n  'id',\n  'largeop',\n  'length',\n  'linethickness',\n  'lspace',\n  'lquote',\n  'mathbackground',\n  'mathcolor',\n  'mathsize',\n  'mathvariant',\n  'maxsize',\n  'minsize',\n  'movablelimits',\n  'notation',\n  'numalign',\n  'open',\n  'rowalign',\n  'rowlines',\n  'rowspacing',\n  'rowspan',\n  'rspace',\n  'rquote',\n  'scriptlevel',\n  'scriptminsize',\n  'scriptsizemultiplier',\n  'selection',\n  'separator',\n  'separators',\n  'stretchy',\n  'subscriptshift',\n  'supscriptshift',\n  'symmetric',\n  'voffset',\n  'width',\n  'xmlns',\n]);\n\nexport const xml = freeze([\n  'xlink:href',\n  'xml:id',\n  'xlink:title',\n  'xml:space',\n  'xmlns:xlink',\n]);\n","const seal =\n  Object.seal ||\n  function(x) {\n    return x;\n  };\n\nexport const MUSTACHE_EXPR = seal(/\\{\\{[\\s\\S]*|[\\s\\S]*\\}\\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode\nexport const ERB_EXPR = seal(/<%[\\s\\S]*|[\\s\\S]*%>/gm);\nexport const DATA_ATTR = seal(/^data-[\\-\\w.\\u00B7-\\uFFFF]/); // eslint-disable-line no-useless-escape\nexport const ARIA_ATTR = seal(/^aria-[\\-\\w]+$/); // eslint-disable-line no-useless-escape\nexport const IS_ALLOWED_URI = seal(\n  /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\\-]+(?:[^a-z+.\\-:]|$))/i // eslint-disable-line no-useless-escape\n);\nexport const IS_SCRIPT_OR_DATA = seal(/^(?:\\w+script|data):/i);\nexport const ATTR_WHITESPACE = seal(\n  /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g // eslint-disable-line 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\ No newline at end of file
+{"version":3,"file":"purify.min.js","sources":["../src/utils.js","../src/purify.js","../src/tags.js","../src/attrs.js","../src/regexp.js"],"sourcesContent":["const { hasOwnProperty, setPrototypeOf } = Object;\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/* Add properties to a lookup table */\nexport function addToSet(set, array) {\n  if (setPrototypeOf) {\n    // Make 'in' and truthy checks like Boolean(set.constructor)\n    // independent of any properties defined on Object.prototype.\n    // Prevent prototype setters from intercepting set as a this value.\n    setPrototypeOf(set, null);\n  }\n\n  let l = array.length;\n  while (l--) {\n    let element = array[l];\n    if (typeof element === 'string') {\n      const lcElement = element.toLowerCase();\n      if (lcElement !== element) {\n        // Config presets (e.g. tags.js, attrs.js) are immutable.\n        if (!Object.isFrozen(array)) {\n          array[l] = lcElement;\n        }\n\n        element = lcElement;\n      }\n    }\n\n    set[element] = true;\n  }\n\n  return set;\n}\n\n/* Shallow clone an object */\nexport function clone(object) {\n  const newObject = {};\n\n  let property;\n  for (property in object) {\n    if (apply(hasOwnProperty, object, [property])) {\n      newObject[property] = object[property];\n    }\n  }\n\n  return newObject;\n}\n","import * as TAGS from './tags';\nimport * as ATTRS from './attrs';\nimport { addToSet, clone } from './utils';\nimport * as EXPRESSIONS from './regexp';\n\nlet { apply } = typeof Reflect !== 'undefined' && Reflect;\nconst { slice: arraySlice } = Array.prototype;\nconst { freeze } = Object;\nconst getGlobal = () => (typeof window === 'undefined' ? null : window);\n\nif (!apply) {\n  apply = function(fun, thisValue, args) {\n    return fun.apply(thisValue, args);\n  };\n}\n\n/**\n * Creates a no-op policy for internal use only.\n * Don't export this function outside this module!\n * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.\n * @param {Document} document The document object (to determine policy name suffix)\n * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types\n * are not supported).\n */\nconst _createTrustedTypesPolicy = function(trustedTypes, document) {\n  if (\n    typeof trustedTypes !== 'object' ||\n    typeof trustedTypes.createPolicy !== 'function'\n  ) {\n    return null;\n  }\n\n  // Allow the callers to control the unique policy name\n  // by adding a data-tt-policy-suffix to the script element with the DOMPurify.\n  // Policy creation with duplicate names throws in Trusted Types.\n  let suffix = null;\n  const ATTR_NAME = 'data-tt-policy-suffix';\n  if (\n    document.currentScript &&\n    document.currentScript.hasAttribute(ATTR_NAME)\n  ) {\n    suffix = document.currentScript.getAttribute(ATTR_NAME);\n  }\n\n  const policyName = 'dompurify' + (suffix ? '#' + suffix : '');\n\n  try {\n    return trustedTypes.createPolicy(policyName, {\n      createHTML(html) {\n        return html;\n      },\n    });\n  } catch (error) {\n    // Policy creation failed (most likely another DOMPurify script has\n    // already run). Skip creating the policy, as this will only cause errors\n    // if TT are enforced.\n    console.warn(\n      'TrustedTypes policy ' + policyName + ' could not be created.'\n    );\n    return null;\n  }\n};\n\nfunction createDOMPurify(window = getGlobal()) {\n  const DOMPurify = root => createDOMPurify(root);\n\n  /**\n   * Version label, exposed for easier checks\n   * if DOMPurify is up to date or not\n   */\n  DOMPurify.version = VERSION;\n\n  /**\n   * Array of elements that DOMPurify removed during sanitation.\n   * Empty if nothing was removed.\n   */\n  DOMPurify.removed = [];\n\n  if (!window || !window.document || window.document.nodeType !== 9) {\n    // Not running in a browser, provide a factory function\n    // so that you can pass your own Window\n    DOMPurify.isSupported = false;\n\n    return DOMPurify;\n  }\n\n  const originalDocument = window.document;\n  let useDOMParser = false;\n  let removeTitle = false;\n\n  let { document } = window;\n  const {\n    DocumentFragment,\n    HTMLTemplateElement,\n    Node,\n    NodeFilter,\n    NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap,\n    Text,\n    Comment,\n    DOMParser,\n    TrustedTypes,\n  } = window;\n\n  // As per issue #47, the web-components registry is inherited by a\n  // new document created via createHTMLDocument. As per the spec\n  // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)\n  // a new empty registry is used when creating a template contents owner\n  // document, so we use that as our parent document to ensure nothing\n  // is inherited.\n  if (typeof HTMLTemplateElement === 'function') {\n    const template = document.createElement('template');\n    if (template.content && template.content.ownerDocument) {\n      document = template.content.ownerDocument;\n    }\n  }\n\n  const trustedTypesPolicy = _createTrustedTypesPolicy(\n    TrustedTypes,\n    originalDocument\n  );\n  const emptyHTML = trustedTypesPolicy ? trustedTypesPolicy.createHTML('') : '';\n\n  const {\n    implementation,\n    createNodeIterator,\n    getElementsByTagName,\n    createDocumentFragment,\n  } = document;\n  const { importNode } = originalDocument;\n\n  let hooks = {};\n\n  /**\n   * Expose whether this browser supports running the full DOMPurify.\n   */\n  DOMPurify.isSupported =\n    implementation &&\n    typeof implementation.createHTMLDocument !== 'undefined' &&\n    document.documentMode !== 9;\n\n  const {\n    MUSTACHE_EXPR,\n    ERB_EXPR,\n    DATA_ATTR,\n    ARIA_ATTR,\n    IS_SCRIPT_OR_DATA,\n    ATTR_WHITESPACE,\n  } = EXPRESSIONS;\n\n  let { IS_ALLOWED_URI } = EXPRESSIONS;\n\n  /**\n   * We consider the elements and attributes below to be safe. Ideally\n   * don't add any new ones but feel free to remove unwanted ones.\n   */\n\n  /* allowed element names */\n  let ALLOWED_TAGS = null;\n  const DEFAULT_ALLOWED_TAGS = addToSet({}, [\n    ...TAGS.html,\n    ...TAGS.svg,\n    ...TAGS.svgFilters,\n    ...TAGS.mathMl,\n    ...TAGS.text,\n  ]);\n\n  /* Allowed attribute names */\n  let ALLOWED_ATTR = null;\n  const DEFAULT_ALLOWED_ATTR = addToSet({}, [\n    ...ATTRS.html,\n    ...ATTRS.svg,\n    ...ATTRS.mathMl,\n    ...ATTRS.xml,\n  ]);\n\n  /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */\n  let FORBID_TAGS = null;\n\n  /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */\n  let FORBID_ATTR = null;\n\n  /* Decide if ARIA attributes are okay */\n  let ALLOW_ARIA_ATTR = true;\n\n  /* Decide if custom data attributes are okay */\n  let ALLOW_DATA_ATTR = true;\n\n  /* Decide if unknown protocols are okay */\n  let ALLOW_UNKNOWN_PROTOCOLS = false;\n\n  /* Output should be safe for jQuery's $() factory? */\n  let SAFE_FOR_JQUERY = false;\n\n  /* Output should be safe for common template engines.\n   * This means, DOMPurify removes data attributes, mustaches and ERB\n   */\n  let SAFE_FOR_TEMPLATES = false;\n\n  /* Decide if document with <html>... should be returned */\n  let WHOLE_DOCUMENT = false;\n\n  /* Track whether config is already set on this instance of DOMPurify. */\n  let SET_CONFIG = false;\n\n  /* Decide if all elements (e.g. style, script) must be children of\n   * document.body. By default, browsers might move them to document.head */\n  let FORCE_BODY = false;\n\n  /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html\n   * string (or a TrustedHTML object if Trusted Types are supported).\n   * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead\n   */\n  let RETURN_DOM = false;\n\n  /* Decide if a DOM `DocumentFragment` should be returned, instead of a html\n   * string  (or a TrustedHTML object if Trusted Types are supported) */\n  let RETURN_DOM_FRAGMENT = false;\n\n  /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM\n   * `Node` is imported into the current `Document`. If this flag is not enabled the\n   * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by\n   * DOMPurify. */\n  let RETURN_DOM_IMPORT = false;\n\n  /* Try to return a Trusted Type object instead of a string, retrun a string in\n   * case Trusted Types are not supported  */\n  let RETURN_TRUSTED_TYPE = false;\n\n  /* Output should be free from DOM clobbering attacks? */\n  let SANITIZE_DOM = true;\n\n  /* Keep element content when removing element? */\n  let KEEP_CONTENT = true;\n\n  /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead\n   * of importing it into a new Document and returning a sanitized copy */\n  let IN_PLACE = false;\n\n  /* Allow usage of profiles like html, svg and mathMl */\n  let USE_PROFILES = {};\n\n  /* Tags to ignore content of when KEEP_CONTENT is true */\n  const FORBID_CONTENTS = addToSet({}, [\n    'annotation-xml',\n    'audio',\n    'colgroup',\n    'desc',\n    'foreignobject',\n    'head',\n    'iframe',\n    'math',\n    'mi',\n    'mn',\n    'mo',\n    'ms',\n    'mtext',\n    'noembed',\n    'noframes',\n    'plaintext',\n    'script',\n    'style',\n    'svg',\n    'template',\n    'thead',\n    'title',\n    'video',\n    'xmp',\n  ]);\n\n  /* Tags that are safe for data: URIs */\n  const DATA_URI_TAGS = addToSet({}, [\n    'audio',\n    'video',\n    'img',\n    'source',\n    'image',\n  ]);\n\n  /* Attributes safe for values like \"javascript:\" */\n  let URI_SAFE_ATTRIBUTES = null;\n  const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, [\n    'alt',\n    'class',\n    'for',\n    'id',\n    'label',\n    'name',\n    'pattern',\n    'placeholder',\n    'summary',\n    'title',\n    'value',\n    'style',\n    'xmlns',\n  ]);\n\n  /* Keep a reference to config to pass to hooks */\n  let CONFIG = null;\n\n  /* Ideally, do not touch anything below this line */\n  /* ______________________________________________ */\n\n  const formElement = document.createElement('form');\n\n  /**\n   * _parseConfig\n   *\n   * @param  {Object} cfg optional config literal\n   */\n  // eslint-disable-next-line complexity\n  const _parseConfig = function(cfg) {\n    if (CONFIG && CONFIG === cfg) {\n      return;\n    }\n\n    /* Shield configuration object from tampering */\n    if (!cfg || typeof cfg !== 'object') {\n      cfg = {};\n    }\n\n    /* Set configuration parameters */\n    ALLOWED_TAGS =\n      'ALLOWED_TAGS' in cfg\n        ? addToSet({}, cfg.ALLOWED_TAGS)\n        : DEFAULT_ALLOWED_TAGS;\n    ALLOWED_ATTR =\n      'ALLOWED_ATTR' in cfg\n        ? addToSet({}, cfg.ALLOWED_ATTR)\n        : DEFAULT_ALLOWED_ATTR;\n    URI_SAFE_ATTRIBUTES =\n      'ADD_URI_SAFE_ATTR' in cfg\n        ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR)\n        : DEFAULT_URI_SAFE_ATTRIBUTES;\n    FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};\n    FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};\n    USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;\n    ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true\n    ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true\n    ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false\n    SAFE_FOR_JQUERY = cfg.SAFE_FOR_JQUERY || false; // Default false\n    SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false\n    WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false\n    RETURN_DOM = cfg.RETURN_DOM || false; // Default false\n    RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false\n    RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT || false; // Default false\n    RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false\n    FORCE_BODY = cfg.FORCE_BODY || false; // Default false\n    SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true\n    KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true\n    IN_PLACE = cfg.IN_PLACE || false; // Default false\n\n    IS_ALLOWED_URI = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI;\n\n    if (SAFE_FOR_TEMPLATES) {\n      ALLOW_DATA_ATTR = false;\n    }\n\n    if (RETURN_DOM_FRAGMENT) {\n      RETURN_DOM = true;\n    }\n\n    /* Parse profile info */\n    if (USE_PROFILES) {\n      ALLOWED_TAGS = addToSet({}, [...TAGS.text]);\n      ALLOWED_ATTR = [];\n      if (USE_PROFILES.html === true) {\n        addToSet(ALLOWED_TAGS, TAGS.html);\n        addToSet(ALLOWED_ATTR, ATTRS.html);\n      }\n\n      if (USE_PROFILES.svg === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.svgFilters === true) {\n        addToSet(ALLOWED_TAGS, TAGS.svgFilters);\n        addToSet(ALLOWED_ATTR, ATTRS.svg);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n\n      if (USE_PROFILES.mathMl === true) {\n        addToSet(ALLOWED_TAGS, TAGS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.mathMl);\n        addToSet(ALLOWED_ATTR, ATTRS.xml);\n      }\n    }\n\n    /* Merge configuration parameters */\n    if (cfg.ADD_TAGS) {\n      if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {\n        ALLOWED_TAGS = clone(ALLOWED_TAGS);\n      }\n\n      addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);\n    }\n\n    if (cfg.ADD_ATTR) {\n      if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {\n        ALLOWED_ATTR = clone(ALLOWED_ATTR);\n      }\n\n      addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);\n    }\n\n    if (cfg.ADD_URI_SAFE_ATTR) {\n      addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);\n    }\n\n    /* Add #text in case KEEP_CONTENT is set to true */\n    if (KEEP_CONTENT) {\n      ALLOWED_TAGS['#text'] = true;\n    }\n\n    /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */\n    if (WHOLE_DOCUMENT) {\n      addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);\n    }\n\n    /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */\n    if (ALLOWED_TAGS.table) {\n      addToSet(ALLOWED_TAGS, ['tbody']);\n      delete FORBID_TAGS.tbody;\n    }\n\n    // Prevent further manipulation of configuration.\n    // Not available in IE8, Safari 5, etc.\n    if (freeze) {\n      freeze(cfg);\n    }\n\n    CONFIG = cfg;\n  };\n\n  /**\n   * _forceRemove\n   *\n   * @param  {Node} node a DOM node\n   */\n  const _forceRemove = function(node) {\n    DOMPurify.removed.push({ element: node });\n    try {\n      node.parentNode.removeChild(node);\n    } catch (error) {\n      node.outerHTML = emptyHTML;\n    }\n  };\n\n  /**\n   * _removeAttribute\n   *\n   * @param  {String} name an Attribute name\n   * @param  {Node} node a DOM node\n   */\n  const _removeAttribute = function(name, node) {\n    try {\n      DOMPurify.removed.push({\n        attribute: node.getAttributeNode(name),\n        from: node,\n      });\n    } catch (error) {\n      DOMPurify.removed.push({\n        attribute: null,\n        from: node,\n      });\n    }\n\n    node.removeAttribute(name);\n  };\n\n  /**\n   * _initDocument\n   *\n   * @param  {String} dirty a string of dirty markup\n   * @return {Document} a DOM, filled with the dirty markup\n   */\n  const _initDocument = function(dirty) {\n    /* Create a HTML document */\n    let doc;\n    let leadingWhitespace;\n\n    if (FORCE_BODY) {\n      dirty = '<remove></remove>' + dirty;\n    } else {\n      /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */\n      const matches = dirty.match(/^[\\s]+/);\n      leadingWhitespace = matches && matches[0];\n      if (leadingWhitespace) {\n        dirty = dirty.slice(leadingWhitespace.length);\n      }\n    }\n\n    /* Use DOMParser to workaround Firefox bug (see comment below) */\n    if (useDOMParser) {\n      try {\n        doc = new DOMParser().parseFromString(dirty, 'text/html');\n      } catch (error) {}\n    }\n\n    /* Remove title to fix a mXSS bug in older MS Edge */\n    if (removeTitle) {\n      addToSet(FORBID_TAGS, ['title']);\n    }\n\n    /* Otherwise use createHTMLDocument, because DOMParser is unsafe in\n    Safari (see comment below) */\n    if (!doc || !doc.documentElement) {\n      doc = implementation.createHTMLDocument('');\n      const { body } = doc;\n      body.parentNode.removeChild(body.parentNode.firstElementChild);\n      body.outerHTML = trustedTypesPolicy\n        ? trustedTypesPolicy.createHTML(dirty)\n        : dirty;\n    }\n\n    if (dirty && leadingWhitespace) {\n      doc.body.insertBefore(\n        document.createTextNode(leadingWhitespace),\n        doc.body.childNodes[0] || null\n      );\n    }\n\n    /* Work on whole document or just its body */\n    return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];\n  };\n\n  // Firefox uses a different parser for innerHTML rather than\n  // DOMParser (see https://bugzilla.mozilla.org/show_bug.cgi?id=1205631)\n  // which means that you *must* use DOMParser, otherwise the output may\n  // not be safe if used in a document.write context later.\n  //\n  // So we feature detect the Firefox bug and use the DOMParser if necessary.\n  //\n  // Chrome 77 and other versions ship an mXSS bug that caused a bypass to\n  // happen. We now check for the mXSS trigger and react accordingly.\n  if (DOMPurify.isSupported) {\n    (function() {\n      try {\n        const doc = _initDocument(\n          '<svg><p><textarea><img src=\"</textarea><img src=x abc=1//\">'\n        );\n        if (doc.querySelector('svg img')) {\n          useDOMParser = true;\n        }\n      } catch (error) {}\n    })();\n\n    (function() {\n      try {\n        const doc = _initDocument('<x/><title>&lt;/title&gt;&lt;img&gt;');\n        if (/<\\/title/.test(doc.querySelector('title').innerHTML)) {\n          removeTitle = true;\n        }\n      } catch (error) {}\n    })();\n  }\n\n  /**\n   * _createIterator\n   *\n   * @param  {Document} root document/fragment to create iterator for\n   * @return {Iterator} iterator instance\n   */\n  const _createIterator = function(root) {\n    return createNodeIterator.call(\n      root.ownerDocument || root,\n      root,\n      NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT,\n      () => {\n        return NodeFilter.FILTER_ACCEPT;\n      },\n      false\n    );\n  };\n\n  /**\n   * _isClobbered\n   *\n   * @param  {Node} elm element to check for clobbering attacks\n   * @return {Boolean} true if clobbered, false if safe\n   */\n  const _isClobbered = function(elm) {\n    if (elm instanceof Text || elm instanceof Comment) {\n      return false;\n    }\n\n    if (\n      typeof elm.nodeName !== 'string' ||\n      typeof elm.textContent !== 'string' ||\n      typeof elm.removeChild !== 'function' ||\n      !(elm.attributes instanceof NamedNodeMap) ||\n      typeof elm.removeAttribute !== 'function' ||\n      typeof elm.setAttribute !== 'function' ||\n      typeof elm.namespaceURI !== 'string'\n    ) {\n      return true;\n    }\n\n    return false;\n  };\n\n  /**\n   * _isNode\n   *\n   * @param  {Node} obj object to check whether it's a DOM node\n   * @return {Boolean} true is object is a DOM node\n   */\n  const _isNode = function(obj) {\n    return typeof Node === 'object'\n      ? obj instanceof Node\n      : obj &&\n          typeof obj === 'object' &&\n          typeof obj.nodeType === 'number' &&\n          typeof obj.nodeName === 'string';\n  };\n\n  /**\n   * _executeHook\n   * Execute user configurable hooks\n   *\n   * @param  {String} entryPoint  Name of the hook's entry point\n   * @param  {Node} currentNode node to work on with the hook\n   * @param  {Object} data additional hook parameters\n   */\n  const _executeHook = function(entryPoint, currentNode, data) {\n    if (!hooks[entryPoint]) {\n      return;\n    }\n\n    hooks[entryPoint].forEach(hook => {\n      hook.call(DOMPurify, currentNode, data, CONFIG);\n    });\n  };\n\n  /**\n   * _sanitizeElements\n   *\n   * @protect nodeName\n   * @protect textContent\n   * @protect removeChild\n   *\n   * @param   {Node} currentNode to check for permission to exist\n   * @return  {Boolean} true if node was killed, false if left alive\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeElements = function(currentNode) {\n    let content;\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeElements', currentNode, null);\n\n    /* Check if element is clobbered or can clobber */\n    if (_isClobbered(currentNode)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Now let's check the element's type and name */\n    const tagName = currentNode.nodeName.toLowerCase();\n\n    /* Execute a hook if present */\n    _executeHook('uponSanitizeElement', currentNode, {\n      tagName,\n      allowedTags: ALLOWED_TAGS,\n    });\n\n    /* Take care of an mXSS pattern using p, br inside svg, math */\n    if (\n      (tagName === 'svg' || tagName === 'math') &&\n      currentNode.querySelectorAll('p, br').length !== 0\n    ) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove element if anything forbids its presence */\n    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {\n      /* Keep content except for black-listed elements */\n      if (\n        KEEP_CONTENT &&\n        !FORBID_CONTENTS[tagName] &&\n        typeof currentNode.insertAdjacentHTML === 'function'\n      ) {\n        try {\n          const htmlToInsert = currentNode.innerHTML;\n          currentNode.insertAdjacentHTML(\n            'AfterEnd',\n            trustedTypesPolicy\n              ? trustedTypesPolicy.createHTML(htmlToInsert)\n              : htmlToInsert\n          );\n        } catch (error) {}\n      }\n\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Remove in case a noscript/noembed XSS is suspected */\n    if (tagName === 'noscript' && /<\\/noscript/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    if (tagName === 'noembed' && /<\\/noembed/i.test(currentNode.innerHTML)) {\n      _forceRemove(currentNode);\n      return true;\n    }\n\n    /* Convert markup to cover jQuery behavior */\n    if (\n      SAFE_FOR_JQUERY &&\n      !currentNode.firstElementChild &&\n      (!currentNode.content || !currentNode.content.firstElementChild) &&\n      /</g.test(currentNode.textContent)\n    ) {\n      DOMPurify.removed.push({ element: currentNode.cloneNode() });\n      if (currentNode.innerHTML) {\n        currentNode.innerHTML = currentNode.innerHTML.replace(/</g, '&lt;');\n      } else {\n        currentNode.innerHTML = currentNode.textContent.replace(/</g, '&lt;');\n      }\n    }\n\n    /* Sanitize element content to be template-safe */\n    if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {\n      /* Get the element's text content */\n      content = currentNode.textContent;\n      content = content.replace(MUSTACHE_EXPR, ' ');\n      content = content.replace(ERB_EXPR, ' ');\n      if (currentNode.textContent !== content) {\n        DOMPurify.removed.push({ element: currentNode.cloneNode() });\n        currentNode.textContent = content;\n      }\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeElements', currentNode, null);\n\n    return false;\n  };\n\n  /**\n   * _isValidAttribute\n   *\n   * @param  {string} lcTag Lowercase tag name of containing element.\n   * @param  {string} lcName Lowercase attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid, otherwise false.\n   */\n  // eslint-disable-next-line complexity\n  const _isValidAttribute = function(lcTag, lcName, value) {\n    /* Make sure attribute cannot clobber */\n    if (\n      SANITIZE_DOM &&\n      (lcName === 'id' || lcName === 'name') &&\n      (value in document || value in formElement)\n    ) {\n      return false;\n    }\n\n    /* Allow valid data-* attributes: At least one character after \"-\"\n        (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)\n        XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)\n        We don't need to check the value; it's always URI safe. */\n    if (ALLOW_DATA_ATTR && DATA_ATTR.test(lcName)) {\n      // This attribute is safe\n    } else if (ALLOW_ARIA_ATTR && ARIA_ATTR.test(lcName)) {\n      // This attribute is safe\n      /* Otherwise, check the name is permitted */\n    } else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {\n      return false;\n\n      /* Check value is safe. First, is attr inert? If so, is safe */\n    } else if (URI_SAFE_ATTRIBUTES[lcName]) {\n      // This attribute is safe\n      /* Check no script, data or unknown possibly unsafe URI\n        unless we know URI values are safe for that attribute */\n    } else if (IS_ALLOWED_URI.test(value.replace(ATTR_WHITESPACE, ''))) {\n      // This attribute is safe\n      /* Keep image data URIs alive if src/xlink:href is allowed */\n      /* Further prevent gadget XSS for dynamically built script tags */\n    } else if (\n      (lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') &&\n      lcTag !== 'script' &&\n      value.indexOf('data:') === 0 &&\n      DATA_URI_TAGS[lcTag]\n    ) {\n      // This attribute is safe\n      /* Allow unknown protocols: This provides support for links that\n        are handled by protocol handlers which may be unknown ahead of\n        time, e.g. fb:, spotify: */\n    } else if (\n      ALLOW_UNKNOWN_PROTOCOLS &&\n      !IS_SCRIPT_OR_DATA.test(value.replace(ATTR_WHITESPACE, ''))\n    ) {\n      // This attribute is safe\n      /* Check for binary attributes */\n      // eslint-disable-next-line no-negated-condition\n    } else if (!value) {\n      // Binary attributes are safe at this point\n      /* Anything else, presume unsafe, do not add it back */\n    } else {\n      return false;\n    }\n\n    return true;\n  };\n\n  /**\n   * _sanitizeAttributes\n   *\n   * @protect attributes\n   * @protect nodeName\n   * @protect removeAttribute\n   * @protect setAttribute\n   *\n   * @param  {Node} currentNode to sanitize\n   */\n  // eslint-disable-next-line complexity\n  const _sanitizeAttributes = function(currentNode) {\n    let attr;\n    let value;\n    let lcName;\n    let idAttr;\n    let l;\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeAttributes', currentNode, null);\n\n    let { attributes } = currentNode;\n\n    /* Check if we have attributes; if not we might have a text node */\n    if (!attributes) {\n      return;\n    }\n\n    const hookEvent = {\n      attrName: '',\n      attrValue: '',\n      keepAttr: true,\n      allowedAttributes: ALLOWED_ATTR,\n    };\n    l = attributes.length;\n\n    /* Go backwards over all attributes; safely remove bad ones */\n    while (l--) {\n      attr = attributes[l];\n      const { name, namespaceURI } = attr;\n      value = attr.value.trim();\n      lcName = name.toLowerCase();\n\n      /* Execute a hook if present */\n      hookEvent.attrName = lcName;\n      hookEvent.attrValue = value;\n      hookEvent.keepAttr = true;\n      _executeHook('uponSanitizeAttribute', currentNode, hookEvent);\n      value = hookEvent.attrValue;\n\n      /* Remove attribute */\n      // Safari (iOS + Mac), last tested v8.0.5, crashes if you try to\n      // remove a \"name\" attribute from an <img> tag that has an \"id\"\n      // attribute at the time.\n      if (\n        lcName === 'name' &&\n        currentNode.nodeName === 'IMG' &&\n        attributes.id\n      ) {\n        idAttr = attributes.id;\n        attributes = apply(arraySlice, attributes, []);\n        _removeAttribute('id', currentNode);\n        _removeAttribute(name, currentNode);\n        if (attributes.indexOf(idAttr) > l) {\n          currentNode.setAttribute('id', idAttr.value);\n        }\n      } else if (\n        // This works around a bug in Safari, where input[type=file]\n        // cannot be dynamically set after type has been removed\n        currentNode.nodeName === 'INPUT' &&\n        lcName === 'type' &&\n        value === 'file' &&\n        hookEvent.keepAttr &&\n        (ALLOWED_ATTR[lcName] || !FORBID_ATTR[lcName])\n      ) {\n        continue;\n      } else {\n        // This avoids a crash in Safari v9.0 with double-ids.\n        // The trick is to first set the id to be empty and then to\n        // remove the attribute\n        if (name === 'id') {\n          currentNode.setAttribute(name, '');\n        }\n\n        _removeAttribute(name, currentNode);\n      }\n\n      /* Did the hooks approve of the attribute? */\n      if (!hookEvent.keepAttr) {\n        continue;\n      }\n\n      /* Take care of an mXSS pattern using namespace switches */\n      if (\n        /svg|math/i.test(currentNode.namespaceURI) &&\n        new RegExp(\n          '</(' + Object.keys(FORBID_CONTENTS).join('|') + ')',\n          'i'\n        ).test(value)\n      ) {\n        _removeAttribute(name, currentNode);\n        continue;\n      }\n\n      /* Sanitize attribute content to be template-safe */\n      if (SAFE_FOR_TEMPLATES) {\n        value = value.replace(MUSTACHE_EXPR, ' ');\n        value = value.replace(ERB_EXPR, ' ');\n      }\n\n      /* Is `value` valid for this attribute? */\n      const lcTag = currentNode.nodeName.toLowerCase();\n      if (!_isValidAttribute(lcTag, lcName, value)) {\n        continue;\n      }\n\n      /* Handle invalid data-* attribute set by try-catching it */\n      try {\n        if (namespaceURI) {\n          currentNode.setAttributeNS(namespaceURI, name, value);\n        } else {\n          /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. \"x-schema\". */\n          currentNode.setAttribute(name, value);\n        }\n\n        DOMPurify.removed.pop();\n      } catch (error) {}\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeAttributes', currentNode, null);\n  };\n\n  /**\n   * _sanitizeShadowDOM\n   *\n   * @param  {DocumentFragment} fragment to iterate over recursively\n   */\n  const _sanitizeShadowDOM = function(fragment) {\n    let shadowNode;\n    const shadowIterator = _createIterator(fragment);\n\n    /* Execute a hook if present */\n    _executeHook('beforeSanitizeShadowDOM', fragment, null);\n\n    while ((shadowNode = shadowIterator.nextNode())) {\n      /* Execute a hook if present */\n      _executeHook('uponSanitizeShadowNode', shadowNode, null);\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(shadowNode)) {\n        continue;\n      }\n\n      /* Deep shadow DOM detected */\n      if (shadowNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(shadowNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(shadowNode);\n    }\n\n    /* Execute a hook if present */\n    _executeHook('afterSanitizeShadowDOM', fragment, null);\n  };\n\n  /**\n   * Sanitize\n   * Public method providing core sanitation functionality\n   *\n   * @param {String|Node} dirty string or DOM node\n   * @param {Object} configuration object\n   */\n  // eslint-disable-next-line complexity\n  DOMPurify.sanitize = function(dirty, cfg) {\n    let body;\n    let importedNode;\n    let currentNode;\n    let oldNode;\n    let returnNode;\n    /* Make sure we have a string to sanitize.\n      DO NOT return early, as this will return the wrong type if\n      the user has requested a DOM object rather than a string */\n    if (!dirty) {\n      dirty = '<!-->';\n    }\n\n    /* Stringify, in case dirty is an object */\n    if (typeof dirty !== 'string' && !_isNode(dirty)) {\n      // eslint-disable-next-line no-negated-condition\n      if (typeof dirty.toString !== 'function') {\n        throw new TypeError('toString is not a function');\n      } else {\n        dirty = dirty.toString();\n        if (typeof dirty !== 'string') {\n          throw new TypeError('dirty is not a string, aborting');\n        }\n      }\n    }\n\n    /* Check we can run. Otherwise fall back or ignore */\n    if (!DOMPurify.isSupported) {\n      if (\n        typeof window.toStaticHTML === 'object' ||\n        typeof window.toStaticHTML === 'function'\n      ) {\n        if (typeof dirty === 'string') {\n          return window.toStaticHTML(dirty);\n        }\n\n        if (_isNode(dirty)) {\n          return window.toStaticHTML(dirty.outerHTML);\n        }\n      }\n\n      return dirty;\n    }\n\n    /* Assign config vars */\n    if (!SET_CONFIG) {\n      _parseConfig(cfg);\n    }\n\n    /* Clean up removed elements */\n    DOMPurify.removed = [];\n\n    if (IN_PLACE) {\n      /* No special handling necessary for in-place sanitization */\n    } else if (dirty instanceof Node) {\n      /* If dirty is a DOM element, append to an empty document to avoid\n         elements being stripped by the parser */\n      body = _initDocument('<!-->');\n      importedNode = body.ownerDocument.importNode(dirty, true);\n      if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {\n        /* Node is already a body, use as is */\n        body = importedNode;\n      } else if (importedNode.nodeName === 'HTML') {\n        body = importedNode;\n      } else {\n        // eslint-disable-next-line unicorn/prefer-node-append\n        body.appendChild(importedNode);\n      }\n    } else {\n      /* Exit directly if we have nothing to do */\n      if (\n        !RETURN_DOM &&\n        !SAFE_FOR_TEMPLATES &&\n        !WHOLE_DOCUMENT &&\n        RETURN_TRUSTED_TYPE &&\n        dirty.indexOf('<') === -1\n      ) {\n        return trustedTypesPolicy\n          ? trustedTypesPolicy.createHTML(dirty)\n          : dirty;\n      }\n\n      /* Initialize the document to work on */\n      body = _initDocument(dirty);\n\n      /* Check we have a DOM node from the data */\n      if (!body) {\n        return RETURN_DOM ? null : emptyHTML;\n      }\n    }\n\n    /* Remove first element node (ours) if FORCE_BODY is set */\n    if (body && FORCE_BODY) {\n      _forceRemove(body.firstChild);\n    }\n\n    /* Get node iterator */\n    const nodeIterator = _createIterator(IN_PLACE ? dirty : body);\n\n    /* Now start iterating over the created document */\n    while ((currentNode = nodeIterator.nextNode())) {\n      /* Fix IE's strange behavior with manipulated textNodes #89 */\n      if (currentNode.nodeType === 3 && currentNode === oldNode) {\n        continue;\n      }\n\n      /* Sanitize tags and elements */\n      if (_sanitizeElements(currentNode)) {\n        continue;\n      }\n\n      /* Shadow DOM detected, sanitize it */\n      if (currentNode.content instanceof DocumentFragment) {\n        _sanitizeShadowDOM(currentNode.content);\n      }\n\n      /* Check attributes, sanitize if necessary */\n      _sanitizeAttributes(currentNode);\n\n      oldNode = currentNode;\n    }\n\n    oldNode = null;\n\n    /* If we sanitized `dirty` in-place, return it. */\n    if (IN_PLACE) {\n      return dirty;\n    }\n\n    /* Return sanitized string or DOM */\n    if (RETURN_DOM) {\n      if (RETURN_DOM_FRAGMENT) {\n        returnNode = createDocumentFragment.call(body.ownerDocument);\n\n        while (body.firstChild) {\n          // eslint-disable-next-line unicorn/prefer-node-append\n          returnNode.appendChild(body.firstChild);\n        }\n      } else {\n        returnNode = body;\n      }\n\n      if (RETURN_DOM_IMPORT) {\n        /* AdoptNode() is not used because internal state is not reset\n               (e.g. the past names map of a HTMLFormElement), this is safe\n               in theory but we would rather not risk another attack vector.\n               The state that is cloned by importNode() is explicitly defined\n               by the specs. */\n        returnNode = importNode.call(originalDocument, returnNode, true);\n      }\n\n      return returnNode;\n    }\n\n    let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;\n\n    /* Sanitize final string template-safe */\n    if (SAFE_FOR_TEMPLATES) {\n      serializedHTML = serializedHTML.replace(MUSTACHE_EXPR, ' ');\n      serializedHTML = serializedHTML.replace(ERB_EXPR, ' ');\n    }\n\n    return trustedTypesPolicy && RETURN_TRUSTED_TYPE\n      ? trustedTypesPolicy.createHTML(serializedHTML)\n      : serializedHTML;\n  };\n\n  /**\n   * Public method to set the configuration once\n   * setConfig\n   *\n   * @param {Object} cfg configuration object\n   */\n  DOMPurify.setConfig = function(cfg) {\n    _parseConfig(cfg);\n    SET_CONFIG = true;\n  };\n\n  /**\n   * Public method to remove the configuration\n   * clearConfig\n   *\n   */\n  DOMPurify.clearConfig = function() {\n    CONFIG = null;\n    SET_CONFIG = false;\n  };\n\n  /**\n   * Public method to check if an attribute value is valid.\n   * Uses last set config, if any. Otherwise, uses config defaults.\n   * isValidAttribute\n   *\n   * @param  {string} tag Tag name of containing element.\n   * @param  {string} attr Attribute name.\n   * @param  {string} value Attribute value.\n   * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.\n   */\n  DOMPurify.isValidAttribute = function(tag, attr, value) {\n    /* Initialize shared config vars if necessary. */\n    if (!CONFIG) {\n      _parseConfig({});\n    }\n\n    const lcTag = tag.toLowerCase();\n    const lcName = attr.toLowerCase();\n    return _isValidAttribute(lcTag, lcName, value);\n  };\n\n  /**\n   * AddHook\n   * Public method to add DOMPurify hooks\n   *\n   * @param {String} entryPoint entry point for the hook to add\n   * @param {Function} hookFunction function to execute\n   */\n  DOMPurify.addHook = function(entryPoint, hookFunction) {\n    if (typeof hookFunction !== 'function') {\n      return;\n    }\n\n    hooks[entryPoint] = hooks[entryPoint] || [];\n    hooks[entryPoint].push(hookFunction);\n  };\n\n  /**\n   * RemoveHook\n   * Public method to remove a DOMPurify hook at a given entryPoint\n   * (pops it from the stack of hooks if more are present)\n   *\n   * @param {String} entryPoint entry point for the hook to remove\n   */\n  DOMPurify.removeHook = function(entryPoint) {\n    if (hooks[entryPoint]) {\n      hooks[entryPoint].pop();\n    }\n  };\n\n  /**\n   * RemoveHooks\n   * Public method to remove all DOMPurify hooks at a given entryPoint\n   *\n   * @param  {String} entryPoint entry point for the hooks to remove\n   */\n  DOMPurify.removeHooks = function(entryPoint) {\n    if (hooks[entryPoint]) {\n      hooks[entryPoint] = [];\n    }\n  };\n\n  /**\n   * RemoveAllHooks\n   * Public method to remove all DOMPurify hooks\n   *\n   */\n  DOMPurify.removeAllHooks = function() {\n    hooks = {};\n  };\n\n  return DOMPurify;\n}\n\nexport default createDOMPurify();\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'a',\n  'abbr',\n  'acronym',\n  'address',\n  'area',\n  'article',\n  'aside',\n  'audio',\n  'b',\n  'bdi',\n  'bdo',\n  'big',\n  'blink',\n  'blockquote',\n  'body',\n  'br',\n  'button',\n  'canvas',\n  'caption',\n  'center',\n  'cite',\n  'code',\n  'col',\n  'colgroup',\n  'content',\n  'data',\n  'datalist',\n  'dd',\n  'decorator',\n  'del',\n  'details',\n  'dfn',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'element',\n  'em',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'font',\n  'footer',\n  'form',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hgroup',\n  'hr',\n  'html',\n  'i',\n  'img',\n  'input',\n  'ins',\n  'kbd',\n  'label',\n  'legend',\n  'li',\n  'main',\n  'map',\n  'mark',\n  'marquee',\n  'menu',\n  'menuitem',\n  'meter',\n  'nav',\n  'nobr',\n  'ol',\n  'optgroup',\n  'option',\n  'output',\n  'p',\n  'pre',\n  'progress',\n  'q',\n  'rp',\n  'rt',\n  'ruby',\n  's',\n  'samp',\n  'section',\n  'select',\n  'shadow',\n  'small',\n  'source',\n  'spacer',\n  'span',\n  'strike',\n  'strong',\n  'style',\n  'sub',\n  'summary',\n  'sup',\n  'table',\n  'tbody',\n  'td',\n  'template',\n  'textarea',\n  'tfoot',\n  'th',\n  'thead',\n  'time',\n  'tr',\n  'track',\n  'tt',\n  'u',\n  'ul',\n  'var',\n  'video',\n  'wbr',\n]);\n\n// SVG\nexport const svg = freeze([\n  'svg',\n  'a',\n  'altglyph',\n  'altglyphdef',\n  'altglyphitem',\n  'animatecolor',\n  'animatemotion',\n  'animatetransform',\n  'audio',\n  'canvas',\n  'circle',\n  'clippath',\n  'defs',\n  'desc',\n  'ellipse',\n  'filter',\n  'font',\n  'g',\n  'glyph',\n  'glyphref',\n  'hkern',\n  'image',\n  'line',\n  'lineargradient',\n  'marker',\n  'mask',\n  'metadata',\n  'mpath',\n  'path',\n  'pattern',\n  'polygon',\n  'polyline',\n  'radialgradient',\n  'rect',\n  'stop',\n  'style',\n  'switch',\n  'symbol',\n  'text',\n  'textpath',\n  'title',\n  'tref',\n  'tspan',\n  'video',\n  'view',\n  'vkern',\n]);\n\nexport const svgFilters = freeze([\n  'feBlend',\n  'feColorMatrix',\n  'feComponentTransfer',\n  'feComposite',\n  'feConvolveMatrix',\n  'feDiffuseLighting',\n  'feDisplacementMap',\n  'feDistantLight',\n  'feFlood',\n  'feFuncA',\n  'feFuncB',\n  'feFuncG',\n  'feFuncR',\n  'feGaussianBlur',\n  'feMerge',\n  'feMergeNode',\n  'feMorphology',\n  'feOffset',\n  'fePointLight',\n  'feSpecularLighting',\n  'feSpotLight',\n  'feTile',\n  'feTurbulence',\n]);\n\nexport const mathMl = freeze([\n  'math',\n  'menclose',\n  'merror',\n  'mfenced',\n  'mfrac',\n  'mglyph',\n  'mi',\n  'mlabeledtr',\n  'mmultiscripts',\n  'mn',\n  'mo',\n  'mover',\n  'mpadded',\n  'mphantom',\n  'mroot',\n  'mrow',\n  'ms',\n  'mspace',\n  'msqrt',\n  'mstyle',\n  'msub',\n  'msup',\n  'msubsup',\n  'mtable',\n  'mtd',\n  'mtext',\n  'mtr',\n  'munder',\n  'munderover',\n]);\n\nexport const text = freeze(['#text']);\n","const freeze =\n  Object.freeze ||\n  function(x) {\n    return x;\n  };\n\nexport const html = freeze([\n  'accept',\n  'action',\n  'align',\n  'alt',\n  'autocomplete',\n  'background',\n  'bgcolor',\n  'border',\n  'cellpadding',\n  'cellspacing',\n  'checked',\n  'cite',\n  'class',\n  'clear',\n  'color',\n  'cols',\n  'colspan',\n  'controls',\n  'coords',\n  'crossorigin',\n  'datetime',\n  'default',\n  'dir',\n  'disabled',\n  'download',\n  'enctype',\n  'face',\n  'for',\n  'headers',\n  'height',\n  'hidden',\n  'high',\n  'href',\n  'hreflang',\n  'id',\n  'integrity',\n  'ismap',\n  'label',\n  'lang',\n  'list',\n  'loop',\n  'low',\n  'max',\n  'maxlength',\n  'media',\n  'method',\n  'min',\n  'minlength',\n  'multiple',\n  'name',\n  'noshade',\n  'novalidate',\n  'nowrap',\n  'open',\n  'optimum',\n  'pattern',\n  'placeholder',\n  'poster',\n  'preload',\n  'pubdate',\n  'radiogroup',\n  'readonly',\n  'rel',\n  'required',\n  'rev',\n  'reversed',\n  'role',\n  'rows',\n  'rowspan',\n  'spellcheck',\n  'scope',\n  'selected',\n  'shape',\n  'size',\n  'sizes',\n  'span',\n  'srclang',\n  'start',\n  'src',\n  'srcset',\n  'step',\n  'style',\n  'summary',\n  'tabindex',\n  'title',\n  'type',\n  'usemap',\n  'valign',\n  'value',\n  'width',\n  'xmlns',\n]);\n\nexport const svg = freeze([\n  'accent-height',\n  'accumulate',\n  'additive',\n  'alignment-baseline',\n  'ascent',\n  'attributename',\n  'attributetype',\n  'azimuth',\n  'basefrequency',\n  'baseline-shift',\n  'begin',\n  'bias',\n  'by',\n  'class',\n  'clip',\n  'clip-path',\n  'clip-rule',\n  'color',\n  'color-interpolation',\n  'color-interpolation-filters',\n  'color-profile',\n  'color-rendering',\n  'cx',\n  'cy',\n  'd',\n  'dx',\n  'dy',\n  'diffuseconstant',\n  'direction',\n  'display',\n  'divisor',\n  'dur',\n  'edgemode',\n  'elevation',\n  'end',\n  'fill',\n  'fill-opacity',\n  'fill-rule',\n  'filter',\n  'filterunits',\n  'flood-color',\n  'flood-opacity',\n  'font-family',\n  'font-size',\n  'font-size-adjust',\n  'font-stretch',\n  'font-style',\n  'font-variant',\n  'font-weight',\n  'fx',\n  'fy',\n  'g1',\n  'g2',\n  'glyph-name',\n  'glyphref',\n  'gradientunits',\n  'gradienttransform',\n  'height',\n  'href',\n  'id',\n  'image-rendering',\n  'in',\n  'in2',\n  'k',\n  'k1',\n  'k2',\n  'k3',\n  'k4',\n  'kerning',\n  'keypoints',\n  'keysplines',\n  'keytimes',\n  'lang',\n  'lengthadjust',\n  'letter-spacing',\n  'kernelmatrix',\n  'kernelunitlength',\n  'lighting-color',\n  'local',\n  'marker-end',\n  'marker-mid',\n  'marker-start',\n  'markerheight',\n  'markerunits',\n  'markerwidth',\n  'maskcontentunits',\n  'maskunits',\n  'max',\n  'mask',\n  'media',\n  'method',\n  'mode',\n  'min',\n  'name',\n  'numoctaves',\n  'offset',\n  'operator',\n  'opacity',\n  'order',\n  'orient',\n  'orientation',\n  'origin',\n  'overflow',\n  'paint-order',\n  'path',\n  'pathlength',\n  'patterncontentunits',\n  'patterntransform',\n  'patternunits',\n  'points',\n  'preservealpha',\n  'preserveaspectratio',\n  'primitiveunits',\n  'r',\n  'rx',\n  'ry',\n  'radius',\n  'refx',\n  'refy',\n  'repeatcount',\n  'repeatdur',\n  'restart',\n  'result',\n  'rotate',\n  'scale',\n  'seed',\n  'shape-rendering',\n  'specularconstant',\n  'specularexponent',\n  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\ No newline at end of file
diff --git a/src/purify.js b/src/purify.js
index 4602b853..577e4ec4 100644
--- a/src/purify.js
+++ b/src/purify.js
@@ -514,7 +514,7 @@ function createDOMPurify(window = getGlobal()) {
         : dirty;
     }
 
-    if (leadingWhitespace) {
+    if (dirty && leadingWhitespace) {
       doc.body.insertBefore(
         document.createTextNode(leadingWhitespace),
         doc.body.childNodes[0] || null