Re: [w3c/manifest] Add installation prompt control flow (#417)

> It sounds like you're suggesting we have both the global method and the existing beforeinstallprompt event.

Yes... for backwards compat. I hadn't thought this through...

> So in the reprompt case, you're saying that we would only fire BIP once, but then you could call navigator.requestInstallPrompt many times even after the user has cancelled the first one? 

Yeah, and then we can rate limit, etc. 

> It just seems like bipe.prompt() is going to be redundant, so if we spec both, we might end up essentially speccing something that's deprecated. (i.e., we wouldn't recommend sites use bipe.prompt; rather just always use requestInstallPrompt.

Yeah, essentially, bipe.prompt() would have just called .requestInstallPrompt().

> We'd still want the browser to fire this event on its own, or otherwise it would be backwards-incompatible with existing sites (which would need to now call requestInstallPrompt in order to trigger the BIP?)

Yeah, but it would allow for a gradual phase out of bipe: we (browsers) make no guarantees that a site will continue to meet the criteria for an automated BIPE to be fired. Over time, we could essentially get that number right down to 0.01% or whatever, because no site will meet the criteria to fire the event. There was never a guarantee at all the BIPE would fire in the future. 
 


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