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node_modules/stylelint/lib/rules/property-no-unknown/README.md

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+# property-no-unknown
+
+Disallow unknown properties.
+
+```css
+a { heigth: 100%; }
+/** ↑
+ * These properties */
+```
+
+This rule considers properties defined in the [CSS Specifications and browser specific properties](https://github.com/betit/known-css-properties#source) to be known.
+
+This rule ignores variables (`$sass`, `@less`, `--custom-property`).
+
+This rule ignores vendor-prefixed properties (e.g., `-moz-align-self`, `-webkit-align-self`).
+Use option `checkPrefixed` described below to turn on checking of vendor-prefixed properties.
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+a {
+  colr: blue;
+}
+```
+
+```css
+a {
+  my-property: 1;
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  color: green;
+}
+```
+
+```css
+a {
+  fill: black;
+}
+```
+
+```css
+a {
+  -moz-align-self: center;
+}
+```
+
+```css
+a {
+  -webkit-align-self: center;
+}
+```
+
+```css
+a {
+  align-self: center;
+}
+```
+
+## Optional secondary options
+
+### `ignoreProperties: ["/regex/", "string"]`
+
+Given:
+
+```js
+["/^my-/", "custom"]
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  my-property: 10px;
+}
+```
+
+```css
+a {
+  my-other-property: 10px;
+}
+```
+
+```css
+a {
+  custom: 10px;
+}
+```
+### `checkPrefixed: true | false` (default: `false`)
+
+If `true`, this rule will check vendor-prefixed properties.
+
+For example with `true`:
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  -webkit-overflow-scrolling: auto;
+}
+```
+
+```css
+a {
+  -moz-box-flex: 0;
+}
+```
+
+The following patterns are considered  warnings:
+
+```css
+a {
+  -moz-align-self: center;
+}
+```
+
+```css
+a {
+  -moz-overflow-scrolling: center;
+}
+```

node_modules/stylelint/lib/rules/property-no-unknown/index.js

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+"use strict"
+
+const isCustomProperty = require("../../utils/isCustomProperty")
+const isStandardSyntaxDeclaration = require("../../utils/isStandardSyntaxDeclaration")
+const isStandardSyntaxProperty = require("../../utils/isStandardSyntaxProperty")
+const optionsMatches = require("../../utils/optionsMatches")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const _ = require("lodash")
+const properties = require("known-css-properties").all
+const postcss = require("postcss")
+
+const ruleName = "property-no-unknown"
+
+const messages = ruleMessages(ruleName, {
+  rejected: property => `Unexpected unknown property "${property}"`,
+})
+
+const rule = function (actual, options) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual }, {
+      actual: options,
+      possible: {
+        ignoreProperties: [_.isString],
+        checkPrefixed: _.isBoolean,
+      },
+      optional: true,
+    })
+
+    if (!validOptions) {
+      return
+    }
+
+    const shouldCheckPrefixed = _.get(options, "checkPrefixed")
+
+    root.walkDecls(decl => {
+      const prop = decl.prop
+
+      if (!isStandardSyntaxProperty(prop)) {
+        return
+      }
+      if (!isStandardSyntaxDeclaration(decl)) {
+        return
+      }
+      if (isCustomProperty(prop)) {
+        return
+      }
+
+      if (!shouldCheckPrefixed && postcss.vendor.prefix(prop)) {
+        return
+      }
+
+      if (optionsMatches(options, "ignoreProperties", prop)) {
+        return
+      }
+
+      if (properties.indexOf(prop.toLowerCase()) !== -1) {
+        return
+      }
+
+      report({
+        message: messages.rejected(prop),
+        node: decl,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule