# PostCSS [![Gitter][chat-img]][chat] [chat-img]: https://img.shields.io/badge/Gitter-Join_the_PostCSS_chat-brightgreen.svg [chat]: https://gitter.im/postcss/postcss PostCSS is a tool for transforming styles with JS plugins. These plugins can lint your CSS, support variables and mixins, transpile future CSS syntax, inline images, and more. PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba, and JetBrains. The [Autoprefixer] PostCSS plugin is one of the most popular CSS processors. PostCSS takes a CSS file and provides an API to analyze and modify its rules (by transforming them into an [Abstract Syntax Tree]). This API can then be used by [plugins] to do a lot of useful things, e.g. to find errors automatically insert vendor prefixes. **Support / Discussion:** [Gitter](https://gitter.im/postcss/postcss)
**Twitter account:** [@postcss](https://twitter.com/postcss)
**VK.com page:** [postcss](https://vk.com/postcss)
**中文翻译**: [`README-cn.md`](./README-cn.md) For PostCSS commercial support (consulting, improving the front-end culture of your company, PostCSS plugins), contact [Evil Martians] at . [Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree [Evil Martians]: https://evilmartians.com/?utm_source=postcss [Autoprefixer]: https://github.com/postcss/autoprefixer [plugins]: https://github.com/postcss/postcss#plugins ## Plugins Currently, PostCSS has more than 200 plugins. You can find all of the plugins in the [plugins list] or in the [searchable catalog]. Below is a list of our favorite plugins — the best demonstrations of what can be built on top of PostCSS. If you have any new ideas, [PostCSS plugin development] is really easy. [searchable catalog]: http://postcss.parts [plugins list]: https://github.com/postcss/postcss/blob/master/docs/plugins.md ### Solve Global CSS Problem * [`postcss-use`] allows you to explicitly set PostCSS plugins within CSS and execute them only for the current file. * [`postcss-modules`] and [`react-css-modules`] automatically isolate selectors within components. * [`postcss-autoreset`] is an alternative to using a global reset that is better for isolatable components. * [`postcss-initial`] adds `all: initial` support, which resets all inherited styles. * [`cq-prolyfill`] adds container query support, allowing styles that respond to the width of the parent. ### Use Future CSS, Today * [`autoprefixer`] adds vendor prefixes, using data from Can I Use. * [`postcss-preset-env`] allows you to use future CSS features today. ### Better CSS Readability * [`precss`] contains plugins for Sass-like features, like variables, nesting, and mixins. * [`postcss-sorting`] sorts the content of rules and at-rules. * [`postcss-utilities`] includes the most commonly used shortcuts and helpers. * [`short`] adds and extends numerous shorthand properties. ### Images and Fonts * [`postcss-assets`] inserts image dimensions and inlines files. * [`postcss-sprites`] generates image sprites. * [`font-magician`] generates all the `@font-face` rules needed in CSS. * [`postcss-inline-svg`] allows you to inline SVG and customize its styles. * [`postcss-write-svg`] allows you to write simple SVG directly in your CSS. ### Linters * [`stylelint`] is a modular stylesheet linter. * [`stylefmt`] is a tool that automatically formats CSS according `stylelint` rules. * [`doiuse`] lints CSS for browser support, using data from Can I Use. * [`colorguard`] helps you maintain a consistent color palette. ### Other * [`postcss-rtl`] combines both-directional (left-to-right and right-to-left) styles in one CSS file. * [`cssnano`] is a modular CSS minifier. * [`lost`] is a feature-rich `calc()` grid system. * [`rtlcss`] mirrors styles for right-to-left locales. [PostCSS plugin development]: https://github.com/postcss/postcss/blob/master/docs/writing-a-plugin.md [`postcss-inline-svg`]: https://github.com/TrySound/postcss-inline-svg [`postcss-preset-env`]: https://github.com/jonathantneal/postcss-preset-env [`react-css-modules`]: https://github.com/gajus/react-css-modules [`postcss-autoreset`]: https://github.com/maximkoretskiy/postcss-autoreset [`postcss-write-svg`]: https://github.com/jonathantneal/postcss-write-svg [`postcss-utilities`]: https://github.com/ismamz/postcss-utilities [`postcss-initial`]: https://github.com/maximkoretskiy/postcss-initial [`postcss-sprites`]: https://github.com/2createStudio/postcss-sprites [`postcss-modules`]: https://github.com/outpunk/postcss-modules [`postcss-sorting`]: https://github.com/hudochenkov/postcss-sorting [`postcss-assets`]: https://github.com/assetsjs/postcss-assets [`font-magician`]: https://github.com/jonathantneal/postcss-font-magician [`autoprefixer`]: https://github.com/postcss/autoprefixer [`cq-prolyfill`]: https://github.com/ausi/cq-prolyfill [`postcss-rtl`]: https://github.com/vkalinichev/postcss-rtl [`postcss-use`]: https://github.com/postcss/postcss-use [`css-modules`]: https://github.com/css-modules/css-modules [`colorguard`]: https://github.com/SlexAxton/css-colorguard [`stylelint`]: https://github.com/stylelint/stylelint [`stylefmt`]: https://github.com/morishitter/stylefmt [`cssnano`]: http://cssnano.co [`precss`]: https://github.com/jonathantneal/precss [`doiuse`]: https://github.com/anandthakker/doiuse [`rtlcss`]: https://github.com/MohammadYounes/rtlcss [`short`]: https://github.com/jonathantneal/postcss-short [`lost`]: https://github.com/peterramsing/lost ## Syntaxes PostCSS can transform styles in any syntax, not just CSS. If there is not yet support for your favorite syntax, you can write a parser and/or stringifier to extend PostCSS. * [`sugarss`] is a indent-based syntax like Sass or Stylus. * [`postcss-syntax`] switch syntax automatically by file extensions. * [`postcss-html`] parsing styles in `