Add property-no-unknown rule

src/rules/index.js

@@ -59,6 +59,7 @@ const rules = {
   "operator-no-unspaced": require("./operator-no-unspaced"),
   "partial-no-import": require("./partial-no-import"),
   "percent-placeholder-pattern": require("./percent-placeholder-pattern"),
+  "property-no-unknown": require("./property-no-unknown"),
   "selector-nest-combinators": require("./selector-nest-combinators"),
   "selector-no-redundant-nesting-selector": require("./selector-no-redundant-nesting-selector"),
   "selector-no-union-class-name": require("./selector-no-union-class-name")

src/rules/property-no-unknown/README.md

@@ -0,0 +1,207 @@
+# property-no-unknown
+
+Disallow unknown properties.
+
+<!-- prettier-ignore -->
+```scss
+a { height: 100%; }
+/** ↑
+ * This property */
+```
+
+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`)
+- vendor-prefixed properties (e.g., `-moz-align-self`, `-webkit-align-self`)
+
+Use option `checkPrefixed` described below to turn on checking of vendor-prefixed properties.
+
+The [`message` secondary option](../../../docs/user-guide/configure.md#message) can accept the arguments of this rule.
+
+## Options
+
+### `true`
+
+The following patterns are considered problems:
+
+<!-- prettier-ignore -->
+```scss
+a {
+  colr: blue;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  my-property: 1;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  font: {
+    stuff: bold;
+  }
+}
+```
+
+The following patterns are _not_ considered problems:
+
+<!-- prettier-ignore -->
+```scss
+a {
+  color: green;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  fill: black;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  -moz-align-self: center;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  -webkit-align-self: center;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  align-self: center;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  font: {
+    weight: bold;
+  }
+}
+```
+
+## Optional secondary options
+
+### `ignoreProperties: ["/regex/", /regex/, "string"]`
+
+Given:
+
+```json
+["/^my-/", "custom"]
+```
+
+The following patterns are _not_ considered problems:
+
+<!-- prettier-ignore -->
+```scss
+a {
+  my-property: 10px;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  my-other-property: 10px;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  custom: 10px;
+}
+```
+
+### `ignoreSelectors: ["/regex/", /regex/, "string"]`
+
+Skips checking properties of the given selectors against this rule.
+
+Given:
+
+```json
+[":root"]
+```
+
+The following patterns are _not_ considered problems:
+
+<!-- prettier-ignore -->
+```scss
+:root {
+  my-property: blue;
+}
+```
+
+### `ignoreAtRules: ["/regex/", /regex/, "string"]`
+
+Ignores properties nested within specified at-rules.
+
+Given:
+
+```json
+["supports"]
+```
+
+The following patterns are _not_ considered problems:
+
+<!-- prettier-ignore -->
+```scss
+@supports (display: grid) {
+  a {
+    my-property: 1;
+  }
+}
+```
+
+### `checkPrefixed: true | false` (default: `false`)
+
+If `true`, this rule will check vendor-prefixed properties.
+
+For example with `true`:
+
+The following patterns are _not_ considered problems:
+
+<!-- prettier-ignore -->
+```scss
+a {
+  -webkit-overflow-scrolling: auto;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  -moz-box-flex: 0;
+}
+```
+
+The following patterns are considered problems:
+
+<!-- prettier-ignore -->
+```scss
+a {
+  -moz-align-self: center;
+}
+```
+
+<!-- prettier-ignore -->
+```scss
+a {
+  -moz-overflow-scrolling: center;
+}
+```