Re: [fullscreen] Inconsistency of condition between entering fullscreen and exiting fullscreen (#6)

Thanks, @Hixie! There's no known problem here, just trying to have `showModal()` and `requestFullscreen()` share as much logic as possible.

So the plan is:
* No hierarchy restrictions for `requestFullscreen()`.
* A non-empty top layer stack is what makes every other element inert.
* Some shared algorithms for manipulating the top layer stack might be nice.

Does that sound about right?

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