I've posted this before (but at my age, repeating ones self is common). Probably the best site I've found for understanding HTML5 video is http://diveintohtml5.info/video.htmlDive into HTML5[/link] Unfortunately the guy who originated it, Mark Pilgrim, suddently disappeared from Internet posting and deleted the content of his websites. Luckly someone had a mirrored version and that's what I've linked to above.