They’ve just showed off hardware-accelerated HTML5 at the MIX10 keynote, and it’s damn impressive. Main points:

* Full-screen, HD-encoded video on netbooks — the keynote highlighted the dropped frames in Chrome, while IE9 rendered it fine — made possible by the hardware decoder on the netbook.
* Multiple HTML5 videos on one page? — then they scroll the page down… and there are two HTML5 videos playing full-screen, on the same document! Using only half the CPU (while Chrome used 100%). Can’t see a reason you’d have two full-screen videos on the same page, but it leads into…
* A richer, more animated Web — the demo showed off a video carousel. Rather than the four icons at the top of the Download Squad page, you might see a carousel that rotates. Done entirely in HTML5; no Flash or Silverlight required.

The IE9 keynote has finished, so we’ve now had all of the details. Microsoft says they will be releasing a new Developer Preview (download it here) every 8 weeks — I wonder when it will become a full-blown beta. Surely this year…

More information [Downloadsquad]