Re: [whatwg/fullscreen] Adjust algorithm for FullyExitFullscreen. (#126)

upsuper commented on this pull request.



>  
- <li><p><a lt="unfullscreen an element">Unfullscreen elements</a> whose <a>fullscreen flag</a> is
- set, within <var>document</var>'s <a>top layer</a>, except for <var>document</var>'s
- <a>fullscreen element</a>.
+ <li><p>If <var>topLevelDoc</var>'s <a>fullscreen element</a> is null, terminate these steps.

The condition is possible because there are other callsites to this algorithm, for example, unloading document, and probably for the escaping mechanism. If we don't check here, we would need to guard all callsites with this condition, and we probably still want to assert it in this algorithm to ensure everything runs as expected.

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