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

Not to throw a wrench in the works, but why have this in CSS? This sort of a control (back button, but also forward, etc.) requires JavaScript to work, so wouldn’t it make more sense to have the feature detection happen in JavaScript? That way we’re steering developers toward the best practice of only adding the control to the DOM when it’s useful rather than having it in the DOM for everyone and hiding it when it’s redundant.

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