Re: [whatwg/fullscreen] Deny request on invisible document (#60)

It returns `false` for background window, but `true` for background tab. It seems in Chrome, background tab wouldn't be allowed to enter fullscreen either, how does that work?

We stop background window from entering fullscreen via detecting whether the current document has focus, I think. Chrome seems to allow background window to enter fullscreen. Do we want to add the focus check to the element ready check instead?

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