Re: [manifest] Should a manifest unambigiously and authoritively be the app's metadata? (#376)

Should the spec restrict or mandate how UAs handle:
* the case of multiple web apps using the same manifest_url?
* the case where a page in the `scope` of one manifest links to a different manifest_url?

@slightlyoff said something along the lines: "all pages linking to a single manifest_url (or being in `scope`) are to be treated as one web app". Does this hold when we don't have the same origin restriction on the manifest_url? And more importantly - do we need to include this in normative text in the spec?

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https://github.com/w3c/manifest/issues/376#issuecomment-98190618