I recently pushed out a change that will use the iframe style embedding for YouTube videos. So it should use the HTML5 video if you have opted into YouTube's HTML5 trial. This will only be used for ...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <!-- ----- --> <div id="intro"> <div id ...
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