Re: [whatwg/fullscreen] User agent needs latitude to end fullscreen when needed (#93)

> if poping up dialog leads to exiting fullscreen in Chrome, could websites rely on that in the future in some case that they should really use `exitFullscreen`?

It's plausible, silly things like that happen all the time on the web platform, although it's impossible to predict which specific silly things will become a problem.

We have two options:
1. Normative requirements (must) about which things should cause the UA to exit fullscreen, so that tests can be written for those cases.
1. Anything short of that, where no shared tests could be written.

If we do the first, it will mean that some UAs will have to add code to exit in places where they don't consider it to be a security precaution, for the purpose of interop.

I would be happy either way. @upsuper, between exiting for modal dialogs and new windows (like Chrome) or an interop risk, which would you prefer?

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