Behavioral Extensions to CSS
CSS3 working draft to allow event handlers to be given in CSS and include Microsoft's HTML components. [Not final specification]
CSS ICC Profile Support Proposal
Working draft to give CSS finer control of reproducibility and accuracy of colors. [Not final specification]
CSS Namespace Enhancements (Proposal)
CSS3 working draft for compatibility with XML namespaces. [Not final specification]
CSS1 Specification
World Wide Web Consortium's CSS Level 1 recommendation.
CSS2 Specification
The official Cascading Style Sheets 2 specification, presented by the World Wide Web Consortium. A comprehensive standards document outlining what CSS2 is with definitions and explanations of all its properties and terminology.
CSS3 module: W3C Selectors
Draft for selectors in CSS3. [Not final specification]
Introduction to CSS3
Draft describing the modularization of CSS3. [Not final specification.]
Multi-column layout in CSS
CSS3 working draft for multi-column layout. [Not final specification]
Paged Media Properties for CSS3
Draft for CSS printing features. [Not final specification]
User Interface for CSS3
Draft for new CSS properties mostly related to styling forms and interactive user interfaces. [Not final specification]