Hardware-accelerated Web page rendering is a complex issue. Using a demo and slides from the most awesome Paul Rouget, I've tried to explain how these things work with Firefox 4 in the video below:

Screenshot of the video player featuring Tristan Nitot about Hardware acceleration in Firefox 4

I hope that I have not oversimplified things too much, so if you happen to be a mozillian working on this very exciting topic and hear me saying things that make you cringe, please lave a comment below!

If you want to know more about what's coming from Mozilla here are a couple of links: