Re: [w3ctag/design-reviews] URL Protocol Handler Registration for PWAs (#482)

Hi @fabiorocha @Maggers @connor-moody @samtan-msft!

@kenchris and I looked at this during a breakout of this week's TAG F2F. Overall we like the idea of adding this functionality to Web App Manifest, but we share the concerns our colleague @dbaron raised in https://github.com/mozilla/standards-positions/issues/340#issuecomment-631797523. We'd like to see this new manifest feature and the existing `registerProtocolHandler()` specced on top of a common underlying model, like how the Fetch spec unified the model for loading subresources. That way we could all trust that these things wouldn't get out-of-sync, and that they could have consistent UIs, permissions, etc. So ideally you'd have a pair of pull requests, one on Web App Manifest and one on HTML, that refactored the existing HTML text to provide the underlying model, and then exposed an additional API into that model in Web App Manifest.

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