Re: [manifest] Allow developers to detect when the user has added the site to their home screen (or equivalent) (#417)

Speaking from the outside (I don't have any real context / expertise here) it would be great if we could figure out how to abstract the different use cases into a single API we could all support.  Eg. what about an 'installstatuschanged' event with a few possible enum values (not all of which would necessarily be applicable in all scenarios/UAs/platforms) like: "manually installed", "automatic prompt", "prompt accepted", "prompt declined", etc?

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https://github.com/w3c/manifest/issues/417#issuecomment-165115743