Ummm, no. It is part of the html5 spec, under embedded content.
http://www.w3.org/html/wg/drafts/html/master/embedded-conten...
18 karma · joined October 30, 2013
http://www.w3.org/html/wg/drafts/html/master/embedded-conten...
Of course, Chrome could implement whatever it likes if it drops any claim to be standards compliant, but until that happens...