The Cascading Style Sheets (CSS) Working Group has published a Working Draft of CSS Basic User Interface Module Level 3 (CSS3 UI). This specification describes user interface related selectors, properties and values that are proposed for CSS level 3 to style HTML and XML (including XHTML). It includes and extends user interface related features from the selectors, properties and values of CSS level 2 revision 1 and Selectors specifications. It uses various selectors, properties and values to style basic user interface elements in a document. CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc. Learn more about the Style Activity.