CSS Level 3 brings with it some incredibly powerful styling features. Rounded corners, soft drop shadows, gradient fills, and so on. These are the kinds of elements our designer friends love to use because they make for attractive sites, but are difficult and time-consuming to implement, involving complex sprite images, extra non-semantic markup, large JavaScript libraries, and other lovely hacks.

A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties

Overflow does some cool things you should know about.

All browsers that support the CSS text-shadow and box-shadow properties also support the new CSS3 RGBa syntax. Which means you can safely combine them today.

Compatibility tables for features in HTML5, CSS3, SVG and other upcoming web technologies