Merge pull request #4188 from shaedrich/postcss

Add topic "PostCSS"

topics/postcss/index.md

@@ -0,0 +1,29 @@
+---
+topic: postcss
+display_name: PostCSS
+short_description: PostCSS is a tool for transforming CSS with JavaScript. It can be used to develop a template language such as Sass and LESS.
+wikipedia_url: https://en.wikipedia.org/wiki/PostCSS
+url: https://postcss.org/
+github_url: https://github.com/postcss
+created_by: Andrey Sitnik, Ben Briggs, Bogdan Chadkin
+released: November 4, 2013
+related: sass, less, ast
+---
+**PostCSS** is a tool for transforming CSS with JavaScript. It can be used to develop a template language such as Sass and LESS. The PostCSS core consists of:
+* CSS parser that generates an [abstract syntax tree](/topics/abstract-syntax-tree)
+* Set of classes that comprises the tree
+* CSS generator that generates a CSS line for the object tree
+* Code map generator for the CSS changes made#
+
+There are official tools making it possible to use PostCSS with build systems such as [Webpack](/topics/webpack), [Gulp](/topics/gulp), and [Grunt](/topics/grunt). There is also a console interface available. [Browserify](/topics/browserify) or Webpack can be used to open PostCSS in a browser.
+
+The complete plugin list can be found on postcss.parts, with some examples listed below.
+* [Autoprefixer](/topics/autoprefixer) to add and clear [browser prefixes](/topics/vendor-prefix).
+* [CSS Modules](/topics/css-modules) to get [CSS selectors](/topics/css-selectors) isolated and code organized. It is supplied as part of Webpack.
+* [stylelint](/topics/stylelint) to analyze CSS code for mistakes and check style consistency.
+* stylefmt fixes the CSS code according to the stylelint settings.
+* PreCSS to perform some Sass/Less preprocessing functions.
+* postcss-preset-env to emulate features from unfinished CSS specification drafts.
+* [cssnano](/topics/cssnano) to make CSS smaller in size by getting rid of the spaces and rewriting the code.
+* [RTLCSS](/RTLCSS) to change CSS code so that the design should be suitable for right-to-left writing (such is applied in Arabic and Hebrew).
+* postcss-assets, postcss-inline-svg and postcss-sprites to work with graphics.