"Firefox 3.5 and Chrome already support the new video
tag of the HTML5 specification. Before it can become a standard,
though, more browsers makers have to agree on the codec.
"The major browser vendors are having trouble agreeing on an
enconding format for the new HTML tag. As Ian Hickson explains in
the whatwg.org mailing list, he removed the two subsections in the
HTML5 spec regarding video and audio due to this nonagreement.
Hickson summarizes the current situation as follows:"