Re: [fullscreen] Styles of former fullscreen elements (#18)

> I can't make a very concrete proposal, because the problem still isn't very clear to me, other than that the computed style can now be different from before the changes, and this can be observable. Some examples of where it'll result in unexpected results might help.

Well, the problem is the observable and even visible broken style.

You can compare this page https://output.jsbin.com/xahifiyitu in different browsers. It seems to me that the behavior of IE/Edge is most sensible. They use the first solution I mentioned above, and thus they return three elements for `document.querySelectorAll(':fullscreen')`.

It is a breaking change to the spec, but IE/Edge successfully shipping it may indicate that not too many authors rely on the spec behavior here. I'd be fine to see the spec gets changed this way instead of what I previously proposed here.

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