.stylelintrc.json

{
  "extends": "stylelint-config-standard",
  "plugins": [],
  "rules": {
    "at-rule-empty-line-before": null,
    "at-rule-no-unknown": [true, {
      "ignoreAtRules": [
        "content",
        "else",
        "function",
        "for",
        "if",
        "each",
        "include",
        "mixin",
        "return"
      ]
    }],
    "comment-empty-line-before": null,
    "function-linear-gradient-no-nonstandard-direction": null,
    "function-name-case": null,
    "function-whitespace-after": null,
    "no-descending-specificity": null,
    "no-duplicate-selectors": null,
    "no-unknown-animations": true,
    "media-feature-name-no-unknown": [true, {
      "ignoreMediaFeatureNames": [
        "prefers-reduced-motion",
        "min--moz-device-pixel-ratio"
      ]
    }],
    "number-leading-zero": "always",
    "property-no-unknown": null,
    "rule-empty-line-before": null,
    "selector-list-comma-newline-after": null,
    "selector-pseudo-element-colon-notation": null,
    "shorthand-property-no-redundant-values": null,
    "unit-allowed-list": ["deg", "em", "ex", "ms", "rem", "%", "s", "px", "vw", "vh"]
  },
  "ignoreFiles": [
    "assets/vendor/**/*.css",
    "tests/Drupal/Tests/Core/Asset/css_test_files/**/*.css"
  ]
}