CSS Preprocessors Docs

CSS Preprocessors Stylus, Sass and {less} Documentation Sass the most mature, stable, and powerful professional grade CSS extension language in the world. CSS Compatible Sass is completely compatible with all versions of CSS. We take this compatibility seriously, so that you can seamlessly use any available CSS libraries. Feature Rich Sass boasts more features and abilities than any other CSS extension language out there. The Sass Core Team has worked endlessly to not only keep up, but stay ahead. Mature Sass has been actively supported for over 13 years by its loving Core Team. Industry Approved Over and over again, the industry is choosing Sass as the premier CSS extension language. Large Community Sass is actively supported and developed by a consortium of several tech companies and hundreds of developers. Frameworks There are an endless number of frameworks built with Sass. Compass, Bourbon, and Susy just to name a few. Stylus EXPRESSIVE, DYNAMIC, ROBUST CSS Features Optional colons Optional semi-colons Optional commas Optional braces Variables Interpolation Mixins Arithmetic Type coercion Dynamic importing Conditionals Iteration Nested selectors Parent referencing Variable function calls Lexical scoping Built-in functions (over 60) In-language functions Optional compression Optional image inlining Stylus executable Robust error reporting Single-line and multi-line comments CSS literal for those tricky times Character escaping TextMate bundle and more! {less} It's CSS, with just a little more. Less (which stands for Leaner Style Sheets) is a backwards-compatible language extension for CSS. This is the official documentation for Less, the language and Less.js, the JavaScript tool that converts your Less styles to CSS styles. Because Less looks just like CSS, learning it is a breeze. Less only makes a few convenient additions to the CSS language, which is one of the reasons it can be learned so quickly.