CSS3 is not part of the HTML5 specification, but it is an integral part of writing HTML5 applications. CSS3 is being developed in tandem with HTML5 and provides many new styles to make web pages look and function better than ever. Things that were once the realm of Photoshop, such as gradients and shadows, are now easily added via styling. Using these new graphics features will make your applications look modern and add character to your applications.
Some of the most exciting additions to CSS are the ability to add gradients and shadows to elements. Rounded corners, a feature that everyone wanted in their web pages, and which were once the realm of many HTML hacks, are now simple to add. It has never been easier to make web pages and applications look good without having to download extra images and code to support them.
You can see examples of all the following CSS3 styles in chapter2/css3-examples/css3-examples.html.