Re: [manifest] Updating is under/incorrectly specified (#384)

> The spec says "By using the manifest URL, a user agent MAY periodically check if the contents of a manifest has been modified" - it doesn't say anything about replacing the manifest with any other manifest linked from any other page within the same URL scope (by default the whole web) which the user happens to navigate to.

OK, here's how I understood it:
Once installed, the app manifest URL is periodically checked for updates. Until it's no longer there (possibly for some time to account for server failures etc), at which point it makes sense to update/replace the installed manifest with a new version linked from the pages within the app.

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https://github.com/w3c/manifest/issues/384#issuecomment-119588424