CSS File Documentation

Overview

Feature Value
File Extension .css
MIME Type text/css
Developed by World Wide Web Consortium (W3C)
Primary purpose Styling web documents
Standard specification CSS Level 2.1, CSS Level 3, and ongoing updates
Character set UTF-8 (recommended)
Compression Not natively, but can be minified and gzipped
Media type Stylesheet
Max selectors in a single stylesheet 4095 (for IE 6-9)
Embeddable in HTML Yes, using the <style> element
External linking in HTML Yes, using the <link> element
Property-value pair format property: value;
Importance of cascade Central, determines final applied styles