fix(commons): handle node(s) contained by SVG document when deciphering url properties

lib/commons/dom/url-props-from-attribute.js

@@ -8,8 +8,7 @@
  * @returns {Object}
  */
 dom.urlPropsFromAttribute = function urlPropsFromAttribute(node, attribute) {
-	const value = node[attribute];
-	if (!value) {
+	if (!node.hasAttribute(attribute)) {
 		return undefined;
 	}
 
@@ -18,11 +17,14 @@ dom.urlPropsFromAttribute = function urlPropsFromAttribute(node, attribute) {
 
 	/**
 	 * Note:
-	 * The need to create a parser, is to keep this function generic, to be able to parse resource from element like `iframe` with `src` attribute
+	 * The need to create a parser, is to keep this function generic, to be able to parse resource from element(s) like `iframe` with `src` attribute,
+	 *
+	 * Also, when `a` or `area` is nested inside an svg document,
+	 * they do not have url properties as a HTML Node, hence the check for `ownerSVGElement`
 	 */
-	if (!['A', 'AREA'].includes(nodeName)) {
+	if (!['A', 'AREA'].includes(nodeName) || node.ownerSVGElement) {
 		parser = document.createElement('a');
-		parser.href = value;
+		parser.href = node.getAttribute(attribute);
 	}
 
 	/**
@@ -32,7 +34,14 @@ dom.urlPropsFromAttribute = function urlPropsFromAttribute(node, attribute) {
 		? parser.protocol.replace(/s:$/, ':')
 		: parser.protocol;
 
-	const { pathname, filename } = getPathnameOrFilename(parser.pathname);
+	/**
+	 * certain browser (in this case IE10 & 11)
+	 * does not resolve pathname with a beginning slash, thence prepending with a beginning slash
+	 */
+	const parserPathname = /^\//.test(parser.pathname)
+		? parser.pathname
+		: `/${parser.pathname}`;
+	const { pathname, filename } = getPathnameOrFilename(parserPathname);
 
 	return {
 		protocol,

test/commons/dom/url-props-from-attribute.js

@@ -49,6 +49,27 @@ describe('dom.urlPropsFromAttribute', function() {
 		assert.deepEqual(actual, expected);
 	});
 
+	it('returns URL properties when `A` with empty `HREF`', function() {
+		var vNode = queryFixture('<a id="target" href="">See commons tests</a>');
+		var actual = axe.commons.dom.urlPropsFromAttribute(
+			vNode.actualNode,
+			'href'
+		);
+		/**
+		 * Note:
+		 * Given `a` has empty `href`, the url props will depend on the context in which the page is loaded
+		 * eg:
+		 * 	- http://localhost:9876/test/commons
+		 *  - http://localhost:9876/test/commons/?grep=url...
+		 *
+		 * Hence only asserting the what we know to be static values
+		 */
+		assert.equal(actual.protocol, 'http:');
+		assert.equal(actual.hostname, 'localhost');
+		assert.equal(actual.port, '9876');
+		assert.equal(actual.pathname, '/test/commons/');
+	});
+
 	it('returns URL properties for `A` with `HREF` (having HTTPS protocol)', function() {
 		var vNode = queryFixture(
 			'<a id="target" href="https://facebook.com">follow us on Facebook</a>'
@@ -220,4 +241,26 @@ describe('dom.urlPropsFromAttribute', function() {
 		);
 		assert.deepEqual(actual, expected);
 	});
+
+	it('returns URL properties for `A` with `HREF` that is contained in SVG document', function() {
+		var vNode = queryFixture(
+			'<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">' +
+				'<a id="target" href="http://mysite.com/directory/widgets/calendar.html" aria-label="Book tour"><circle cx="50" cy="40" r="35" /></a>' +
+				'</svg>'
+		);
+		var expected = {
+			filename: 'calendar.html',
+			hash: '',
+			hostname: 'mysite.com',
+			pathname: '/directory/widgets/',
+			port: '',
+			protocol: 'http:',
+			search: {}
+		};
+		var actual = axe.commons.dom.urlPropsFromAttribute(
+			vNode.actualNode,
+			'href'
+		);
+		assert.deepEqual(actual, expected);
+	});
 });

test/integration/rules/identical-links-same-purpose/identical-links-same-purpose.html

@@ -99,6 +99,38 @@
 <a id="pass15" href="/home">Pass 15</a>
 <a id="pass15-identical1" href="http://localhost:9876/home">Pass 15</a>
 
+<!-- ARIA links, with same resource, where one inside svg document -->
+<a id="pass16" href="http://deque.com">Pass 16</a>
+<svg
+	viewBox="0 0 100 100"
+	xmlns="http://www.w3.org/2000/svg"
+	xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+	<a id="pass16-identical1" href="http://deque.com" aria-label="Pass 16">
+		<circle cx="50" cy="40" r="35" />
+	</a>
+</svg>
+
+<!-- ARIA links, with same resource, both are inside svg document -->
+<svg
+	viewBox="0 0 100 100"
+	xmlns="http://www.w3.org/2000/svg"
+	xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+	<a href="http://deque.com" aria-label="Pass 17" id="pass17">
+		<circle cx="50" cy="40" r="35" />
+	</a>
+	<a href="http://deque.com" id="pass17-identical1">
+		<text x="50" y="90" text-anchor="middle">
+			Pass 17
+		</text>
+	</a>
+</svg>
+
+<!-- native links with identical name and empty resource (href) -->
+<a id="pass18" href="">Pass 18</a>
+<a id="pass18-identical1" href="">Pass 18</a>
+
 <!-- incomplete -->
 <!-- Note:identical incomplete nodes are appended as relatedNodes -->
 <!-- native links with different purpose -->

test/integration/rules/identical-links-same-purpose/identical-links-same-purpose.json

@@ -19,7 +19,10 @@
 		["#pass13"],
 		["#pass13-identical-resource-but-different-name"],
 		["#pass14"],
-		["#pass15"]
+		["#pass15"],
+		["#pass16"],
+		["#pass17"],
+		["#pass18"]
 	],
 	"incomplete": [
 		["#incomplete1"],