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

You're right, it doesn't in the spec nor in Blink's implementation, I was fooled by the rather similar rendering.

Given that, it seems pretty reasonable to say that whenever the top layer stack is non-empty, everything except the top element is inert. When trying to add something that is inert to the top layer, there are two options:
1. Just do it, which is apparently what `showModal()` does.
2. Fail with an exception, error event or rejected promise depending on the API.

Preferences?

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