.stylelintrc

{
    "extends": "stylelint-config-standard",
    "plugins": [
      "stylelint-order"
    ],
    "rules": {
        "indentation": 2,
        "string-quotes": "double",
        "no-duplicate-selectors": true,
        "color-hex-case": "lower",
        "color-hex-length": "short",
        "color-named": "never",
        "selector-no-qualifying-type":  [ true, {"ignore": "attribute"} ],
        "selector-max-id": 1,
        "selector-max-attribute": 1,
        "selector-combinator-space-after": "always",
        "selector-attribute-quotes": "always",
        "selector-attribute-operator-space-before": "always",
        "selector-attribute-operator-space-after": "always",
        "selector-attribute-brackets-space-inside": "never",
        "declaration-block-trailing-semicolon": "always",
        "declaration-no-important": true,
        "declaration-colon-space-before": "never",
        "declaration-colon-space-after": "always",
        "property-no-vendor-prefix": true,
        "value-no-vendor-prefix": true,
        "number-leading-zero": "never",
        "function-url-quotes": "always",
        "font-weight-notation": "numeric",
        "font-family-name-quotes": "always-where-recommended",
        "comment-whitespace-inside": "always",
        "comment-empty-line-before": "always",
        "at-rule-no-vendor-prefix": true,
        "rule-empty-line-before": ["always", {
          "except": [
            "after-single-line-comment",
            "inside-block-and-after-rule"
          ],
          "ignore": [
            "after-comment",
            "inside-block"
          ]
        }],
        "selector-pseudo-element-colon-notation": "double",
        "selector-pseudo-class-parentheses-space-inside": "never",
        "selector-no-vendor-prefix": true,
        "selector-max-universal": 1,
        "selector-max-type": 1,
        "media-feature-range-operator-space-before": "always",
        "media-feature-range-operator-space-after": "always",
        "media-feature-parentheses-space-inside": "never",
        "media-feature-name-no-vendor-prefix": true,
        "media-feature-colon-space-before": "never",
        "media-feature-colon-space-after": "always",
        "declaration-block-no-duplicate-properties": true,
        "declaration-block-no-redundant-longhand-properties": [ true, {"ignoreShorthands": "font"} ],
        "no-eol-whitespace": true,
        "order/order": [
          "custom-properties",
          "declarations"
        ],
        "order/properties-alphabetical-order": true
    },
    "ignoreFiles": [
      "./webcompat/static/css/development/vendor/prism.css"
    ],
    "ignoreShorthands": [
        "font"
    ]
}