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

Ignoring the CSS vs JS debate, I think what I was getting at is maybe tangental / off-topic to detecting if the button exists, so we can skip it for this debate, but I wanted to clarify anyways in case it's of interest later.

Rather, I'd like to know _if_ it was used. When a user is cruising around the site and goes back (via browser, chrome, hardware, swipe*, whatever)...essentially all we get is a popState event. We don't know how came to be popping. So while we can have per-system functionality, we cannot have per-trigger functionality. As pointed out, there's ways we can work around this (e.g. assuming any back on android closes), and the dropdown / modal is a bad example as it's screen cover based instead of input based. But I bring it up, as I remember that being a difference to android development with stack management, you could detect how the user was navigating.

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