# 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) | [Create React App](INSTALL.md#create-react-app) | [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