Re: [whatwg/fullscreen] Remove nodes from top layer as part of the removing steps (#102)

> The problem is unrelated to hierarchy restrictions. It is more about that whether a `<dialog>` can go fullscreen. If a `<dialog>` itself can go fullscreen, then HTML spec removing it from top layer may pose unexpected result in various algorithms when the `<dialog>` is in fullscreen.

Right, not having to worry about such interaction would be good. In https://github.com/whatwg/fullscreen/pull/91#issuecomment-303340846 I added use counters to answer this question, and we have numbers from the stable channel now:
https://www.chromestatus.com/metrics/feature/timeline/popularity/1998
https://www.chromestatus.com/metrics/feature/timeline/popularity/1999

In other words, it essentially never happens, and I would happily add that restriction to Blink. If we do that, I think that simplified this issue somewhat.

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