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See http://labs.divx.com/html5/ to see if your browser supports H264 demo. Both Chrome and IE9 do for me and I am still asked to install QuickTime.

In fact my chrome is working with MP4 video and this appears just to be Apple pushing quicktime on to Chrome users.

It could be a broken test for support, or UA sniffing or something. I'll file a bug against the site.