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+# PostCSS HWB Function [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][postcss]
+
+[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/postcss-hwb-function.svg" height="20">][npm-url]
+[<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/hwb-function.svg" height="20">][css-url]
+[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/workflows/test/badge.svg" height="20">][cli-url]
+[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
+
+
+[PostCSS HWB Function] lets you use `hwb` color functions in
+CSS, following the [CSS Color] specification.
+
+```pcss
+a {
+	color: hwb(194 0% 0%);
+	color: hwb(194 0% 0% / .5);
+}
+
+/* becomes */
+
+a {
+	color: rgb(0, 195, 255);
+	color: rgba(0, 195, 255, .5);
+}
+```
+
+## Usage
+
+Add [PostCSS HWB Function] to your project:
+
+```bash
+npm install postcss @csstools/postcss-hwb-function --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssHWBFunction = require('@csstools/postcss-hwb-function');
+
+postcss([
+  postcssHWBFunction(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS HWB Function] runs in all Node environments, with special
+instructions for:
+
+| [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
+| --- | --- | --- | --- | --- |
+
+## Options
+
+### preserve
+
+The `preserve` option determines whether the original functional color notation
+is preserved. By default, it is not preserved.
+
+```js
+postcssHWBFunction({ preserve: true })
+```
+
+```pcss
+a {
+	color: hwb(194 0% 0%);
+	color: hwb(194 0% 0% / .5);
+}
+
+/* becomes */
+
+a {
+	color: rgb(0, 195, 255);
+	color: hwb(194 0% 0%);
+	color: rgba(0, 195, 255, .5);
+	color: hwb(194 0% 0% / .5);
+}
+```
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#hwb-function
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/@csstools/postcss-hwb-function
+
+[CSS Color]: https://drafts.csswg.org/css-color/#the-hwb-notation
+[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
+[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Loader]: https://github.com/postcss/postcss-loader
+[PostCSS HWB Function]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-hwb-function