Re: [whatwg/fullscreen] Change algorithm of "collect documents to unfullscreen" (#72)

> This should be easy enough to write a test for to see the currently implemented behavior, and I don't see it covered in https://github.com/w3c/web-platform-tests/tree/master/fullscreen/api

Yep, that should be easy. Just have an iframe whose content page request fullscreen twice and exit once.

> But the fix is still to just fix https://fullscreen.spec.whatwg.org/#collect-documents-to-unfullscreen and not repeat any "iframe fullscreen flag" outside of it, right? Just checking since that's what your changes do.

Right, because in the new algorithm, outside the "collect documents to fullscreen", there would be nothing added to "exitDocs", and thus there is no need to check that flag outside it.

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