Re: [fullscreen] Styles of former fullscreen elements (#18)

OK, so to summarize, the only change would be to make `:fullscreen` match any element with the fullscreen flag set? That seems OK, even if it's a bit weird that we'll have a single `Document.fullscreenElement` and in some cases `document.querySelector(':fullscreen')` will not return that element.

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https://github.com/whatwg/fullscreen/issues/18#issuecomment-134877096