.stylelintrc.json

{
  "extends": "/usr/lib/node_modules/stylelint-config-standard",
  "plugins": [
    "/usr/lib/node_modules/stylelint-no-browser-hacks/lib"
  ],
  "rules": {
    "at-rule-empty-line-before": null,
    "block-no-empty": null,
    "color-hex-case": null,
    "color-hex-length": null,
    "comment-empty-line-before": null,
    "declaration-block-no-duplicate-properties": null,
    "declaration-block-no-redundant-longhand-properties": null,
    "declaration-block-no-shorthand-property-overrides": null,
    "declaration-block-trailing-semicolon": null,
    "declaration-colon-space-after": null,
    "function-comma-space-after": null,
    "function-linear-gradient-no-nonstandard-direction": null,
    "function-name-case": null,
    "function-whitespace-after": null,
    "length-zero-no-unit": null,
    "no-empty-source": null,
    "no-unknown-animations": true,
    "number-leading-zero": null,
    "number-no-trailing-zeros": null,
    "plugin/no-browser-hacks": [true, {
      "browsers": [
        "ie >= 9",
        "edge >= 13",
        "firefox >= 5",
        "opera >= 12",
        "safari >= 5",
        "chrome >= 56"
      ]
    }],
    "property-no-unknown": null,
    "rule-empty-line-before": null,
    "selector-pseudo-element-colon-notation": null,
    "selector-type-no-unknown": null,
    "shorthand-property-no-redundant-values": null,
    "unit-whitelist": ["deg", "em", "ex", "ms", "rem", "%", "s", "px"]
  },
  "ignoreFiles": [
    "assets/vendor/**/*.css",
    "tests/Drupal/Tests/Core/Asset/css_test_files/**/*.css"
  ]
}