Currently Webkit only (uses CSS3 animation with the Webkit prefix). Did a fairly good job on a keyframe/tween animation I'd done. There were a few problems with masked images but I imagine that could be fixed.

Most features are supported where the HTML/CSS equivalent exists. No support for any Actionscript conversion (oh if only AS3 hadn't decided to reinvent itself as Java 2 this might have been possible).

Questions:

1. How modular is the code produced? Could I easily use Flash to create chunks of animation but then control them via Javascript?

2. Will Mozilla ever support CSS Animation? Last I heard they weren't too keen on it.

3. IE? Scratch that. I'm not even going to ask.