CSS - Stylesheet language

CSS, aka Cascading Style Sheets, is a 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...

CSS Wikipedia page
CSS docs
There are at least 4,446,834 CSS repos on GitHub
CSS first developed in Conseil Européen pour la Recherche Nucléaire
PLDB estimates there are currently 46k job openings for CSS programmers.
file extensions for CSS include css
The Google BigQuery Public Dataset GitHub snapshot shows 506k users using CSS in 809k repos on GitHub
Check out the 963 CSS meetup groups on Meetup.com.
ANTLR grammar for CSS
CodeMirror package for syntax highlighting CSS
Monaco package for syntax highlighting CSS
Pygments supports syntax highlighting for CSS
GitHub supports syntax highlighting for CSS
Indeed.com has 16,898 matches for "css developer".
See also: (6 related languages)HTML, JavaScript, WebGL, XML, SVG, XPath
Read more about CSS on the web: 1.

Example from hello-world:

body::before {
    content: "Hello World";
}

Example from the Hello World Collection:

/* 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
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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;
}