There are two big players here: MP4 (using the H.264 codec) and WebM. As the Longtail report notes, browser support is split 50/50, but that will soon change. Firefox will soon add MP4 support, giving ...

Now, if a user has a HTML5-capable browser, it will be served up by default. If a Web browser isn’t fully HTML5-capable, some HTML video controls may still be displayed, Dougherty wrote.

HTML5 video doesn't yet have all the features of Flash, and it likely won't for several years to come. The Longtail report notes that only half the browsers support fullscreen playback, an essential ...