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

I see, you want to prevent the case where a child of an active `<dialog>` goes fullscreen as well. That is what your definition does, but I was thinking about siblings only.

`<video>` inside a `<dialog>` doesn't seem too far-fetched to me, ads in dialogs seem pretty common on mobile and I don't know why video ads might not end up there. Not being able to watch that video in fullscreen seems odd.

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