CSS 3

CSS3 module: Syntax
http://www.w3.org/TR/css3-syntax/

Introduction to CSS3
http://www.w3.org/TR/css3-roadmap/

CSS3 Basic User Interface Module
http://www.w3.org/TR/css3-ui/

CSS3 Ruby Module
http://www.w3.org/TR/css3-ruby/

CSS3 HTML test cases
http://www.w3.org/Style/CSS/Test/CSS3/Selectors/current/html/index.html