A List Apart: Articles: Taking Advantage of HTML5 and CSS3 with Modernizr
http://www.alistapart.com/articles/taking-advantage-of-html5-and-css3-with-modernizr/
Modernizr Test Suite
http://modernizr.github.com/Modernizr/output.html

Modernizr detects feature support across JS APIs and CSS. Now, there is a simple page that shows you what Modernizr thinks of your browserhttp://www.modernizr.com/

Modernizr detects feature support across JS APIs and CSS. Now, there is a simple page that shows you what Modernizr thinks of your browserhttp://www.modernizr.com/