Re: [w3c/manifest] Add a way to query whether there is a UA-provided back button (#693)

Sounds good to me!

Just one thing: what about cases where there is a back button in window mode, and no back button in fullscreen mode.

For example, a normal browser window would have the `back-button` but what happens if the user switches to fullscreen: in this case the back button isn't there anymore. Would the value be dynamically updated in this case?

Likewise, most recent OS allow to switch almost any app to fullscreen in which case the back button that was there previously isn't visible anymore. Sometimes you can make it appear (like moving your mouse on the top of the screen), but sometimes you have to first exit fullscreen to make it appear again.

I guess it's not that simple..

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