"The principal problem with using HTML 5 and CSS 3 isn't the adoption rate or the differences between browsers, it is knowing what those differences are in the first place. Once that is known developers can work around the limitations using graceful degradation techniques. To help figure that out many turn to the open source project Modernizr."

"AccDC is a powerful dynamic content management framework that accelerates dynamic behaviors for Rich Internet Applications, which can be integrated with any architecture or platform that supports JavaScript. AccDC can be used as a standalone API, or in conjunction with jQuery, YUI, Ext JS, Prototype, Glow, Dojo, GWT, MooTools, Processing, Raphael, X, Tridion, or any other JavaScript library or framework without conflict. The focus of AccDC is minimalism, so that all features are designed to be as condensed, powerful, and fast as possible. "