PostCSS

PostCSS is a software development tool that uses JavaScript-based plugins to automate routine CSS operations

PostCSS is a framework to develop CSS tools.[5] It can be used to develop a template language such as Sass and LESS.[6] The PostCSS core consists of:[7] CSS parser that generates an 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 Features are made available through plugins. The plugins are small programs working with the object tree. After the core has transformed a CSS string into an object tree, the plugins analyze and change the tree. Then PostCSS generates a new CSS string for the plugin-changed tree.