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One or more keys should be available to fully exit fullscreen. http://lists.w3.org/Archives/Public/public-webapps/2012OctDec/thread.html#msg155
Wouldn't this be specifying UI? On mobile it's the home button, back button or swiping from the top the exits fullscreen, and on desktop there's a "deny" button you can click in addition to pressing escape.
Yeah I guess this is already made clear.