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

To provide the context again, the present issue came out of https://github.com/w3c/manifest/issues/673.

> On iOS, the share button IS prominent and this is a serious piece of market share in light of PWAs.

We're talking standalone/fullscreen/minimal-ui PWAs here, so there is no prominent share button on iOS.

> you can't for "share" functionality

I would politely disagree. Right now, you can treat the Share API as a progressive enhancement and fall back to in-app share buttons or libraries seamlessly (without sharing to apps, of course).

> Double back navigation and interfering bottom navigation are two problems of the very same kind. 

Again this proposal is about standalone/fullscreen/minimal-ui, so I don't think they are comparable problems. Apart from that, moving the navigation bar could on some UAs even be [a configurable option](https://android.gadgethacks.com/how-to/move-chromes-address-bar-bottom-your-screen-android-0176946/). 

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