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

@anssiko, the layout tests have been updated for the latest changes, [this one](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/LayoutTests/app_banner/app-banner-event-prompt.html) is probably the best one to look at.

The explainer.md is a little out of date, so the tests are probably a better reference for what Chrome has implemented. Specific things I noticed: `accepted` is returned for completed installs, not `installed`, and `e.prompt()` returns a promise, which explainer.md doesn't explain.

---
Reply to this email directly or view it on GitHub:
https://github.com/w3c/manifest/issues/417#issuecomment-184532904