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CSS, aka Cascading Style Sheets, is an open source stylesheet language created in 1996 by Håkon Wium Lie.

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Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language. Although most often used to set the visual style of web pages and user interfaces written in HTML and XHTML, the language can be applied to any XML document, including plain XML, SVG and XUL, and is applicable to rendering in speech, or on other media. Along with HTML and JavaScript, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications. Read more on Wikipedia...

Example from hello-world:
body::before { content: "Hello World"; }
/* Hello World in CSS */ body:before { content: "Hello World"; }
Example from Linguist:
/*! * Bootstrap v2.3.1 * * Copyright 2012 Twitter, Inc * Licensed under the Apache License v2.0 * * * Designed and built with all the love in the world @twitter by @mdo and @fat. */ .clearfix{*zoom:1;}.clearfix:before,.clearfix:after{display:table;content:"";line-height:0;} .clearfix:after{clear:both;} .hide-text{font:0/0 a;color:transparent;text-shadow:none;background-color:transparent;border:0;} .input-block-level{display:block;width:100%;min-height:30px;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;} article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{display:block;} audio,canvas,video{display:inline-block;*display:inline;*zoom:1;} audio:not([controls]){display:none;} html{font-size:100%;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;} a:focus{outline:thin dotted #333;outline:5px auto -webkit-focus-ring-color;outline-offset:-2px;} a:hover,a:active{outline:0;} sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline;} sup{top:-0.5em;} sub{bottom:-0.25em;} img{max-width:100%;width:auto\9;height:auto;vertical-align:middle;border:0;-ms-interpolation-mode:bicubic;} #map_canvas img,.google-maps img{max-width:none;} button,input,select,textarea{margin:0;font-size:100%;vertical-align:middle;} button,input{*overflow:visible;line-height:normal;} button::-moz-focus-inner,input::-moz-focus-inner{padding:0;border:0;} button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer;} label,select,button,input[type="button"],input[type="reset"],input[type="submit"],input[type="radio"],input[type="checkbox"]{cursor:pointer;} input[type="search"]{-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box;-webkit-appearance:textfield;} input[type="search"]::-webkit-search-decoration,input[type="search"]::-webkit-search-cancel-button{-webkit-appearance:none;} textarea{overflow:
Example from Wikipedia:
body { overflow: hidden; background: #000000; }

Language features

Feature Supported Token Example
Strings "
"Hello world"
Case Insensitive Identifiers
MultiLine Comments /* */
/* A comment
/* This is a single-line comment */ p { color: red; }
File Imports
@import 'custom.css';
Semantic Indentation X
Line Comments X
Ternary operators X
Functions X
Disk Output X
Mixins X
Enums X

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