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

You mean whether this is okay:

> The invariant would be that when adding an element to the top layer, the top layer must either be empty, or its top element must be a non-inclusive ancestor of the element being added.

That is okay with me. Does `<dialog>` have some kind of failure mode currently? How would we best define this?

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https://github.com/whatwg/fullscreen/issues/6#issuecomment-120962935