Re: [whatwg/fullscreen] Reinstate the hierarchy restrictions (#91)

> Actually, if we add a check for dialog in requestFullscreen(), then no check should be needed in showModal(). With the current state of things, no dialog elements in top layer would be fullscreen, and all non-dialog elements would be.

I mean we check whether the element is a modal dialog, not that whether it is a dialog element. But well, I guess we can just simple reject dialog from entering fullscreen if that sounds simpler... but could that be breaking?

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