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

I think this is a great idea. Two thoughts/questions to add:

- Would it be extensible to allow for checking of a share button? Or do you imply that a back button always means a full browser navbar is available, including share? Could be a risky assumption. 

- A bit unrelated, but would it also be possible to check navigation-control position or orientation? (top, bottom, etc). Example is a non-fullscreen PWA with nav docked to bottom yet the browser has its navbar also in the bottom. This can lead to serious usability issues, and is a fairly common issue on iOS, not sure about Android.

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