Re: [whatwg/fullscreen] Introduce document.exitFullscreen({ fully: true })? (#70)

> `querySelectorAll` ... usage is common enough, we can certainly optimize it from the UA side (based on top layer stack that UAs are aware of)

Think about it twice, I think it would be easier to optimize if fullscreen elements have hierarchy restriction, since `querySelectorAll` needs to return element in tree order. Maybe we can revisit #140?

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