Re: [whatwg/fullscreen] Ending fullscreen for popups (#116)

Aligning on Edge's behavior makes good sense to me. I think these are the bits in HTML that would need calls to this spec:
* opening a popup: [window open steps](https://html.spec.whatwg.org/#window-open-steps) and/or [the rules for choosing a browsing context](https://html.spec.whatwg.org/#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name) and/or [navigate](https://html.spec.whatwg.org/#navigate)
* focusing a popup: [`focus(options)`](https://html.spec.whatwg.org/#dom-focus) or [focusing steps](https://html.spec.whatwg.org/#focusing-steps)

@avidrissman, do you already know which steps you want to add there?

@toddreifsteck, can you help us check what Edge does, if there's anything that isn't quite what it seems like from black box testing?

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