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You can specify multiple video sources with . Thus, annoyingly, you can encode OGG and H.264 files and the browser will pick the right thing.

What good is HTML5 audio/video support without mandatory Ogg? It seems that (thanks to Nokia) we'll see the the same old "each browser does it its own way". Firefox will go with Ogg, IE will pretty surely go with WMV/WMA, and Apple, it seems, will go with MPEG4. The obvious outcome is that Flash/FLV will continue being used because it's the common denominator. And that sucks...

"Another impressive feature that Web application developers will be able to take advantage of in Firefox 3.1 is support for worker threads, which provide support for concurrent execution in JavaScript. Worker threads will make it possible to perform complex computations in the background, so that the browser and Web application don't hang or become unresponsive.

The HTML 5 video element will also arrive in Firefox 3.1. This will allow video content to be embedded directly in Web pages, controlled with JavaScript, and manipulated through the DOM. It's a major step forward for rich media content on the Web. Firefox 3.1 will ship with built-in support for the Ogg Vorbis and Theora formats—open audio and video codecs that are believed to be unencumbered by patents. The actual codec implementations are integrated directly into the browser itself, so content in those formats will be playable without requiring any external components or plugins.

Blizzard says that Mozilla aims to encourage an explosion of creativity around video that will mirror the kind of uninhibited innovation that has flourished in the Web's inclusive standards-base ecosystem. Mozilla is actively contributing funding to Ogg development efforts to help accelerate the process. He says that Theora, which is used by Wikipedia, has the potential to achieve quality comparable to MPEG4. High definition video, however, will require the Dirac format, which could eventually be included in future versions of Firefox when it matures."

To illuminate the possibilities that are unlocked by these new features, Blizzard showed several technical demos. One of the demos used the HTML 5 video element to display a space shuttle launch. As the video played, JavaScript code running on the page used the video time index to retrieve launch data from a JavaScript array and draw graphs that show the shuttle's speed and altitude increasing during the launch.

The most impressive demo that he showed during his presentation used JavaScript in worker threads to programmatically detect motion in a playing video. This one has to be seen to be believed