Re: [w3c/manifest] Add id member to manifest (#988)

@philloooo commented on this pull request.



> +          The [=identity=] takes the form of a URL, which is same origin as the
+          start URL.
+        </p>
+        <p>The [=identity=] is used by user agents to uniquely identify the
+        application universally. When the user agent sees a manifest with an
+        [=identity=] that does not correspond to an already-installed application,
+        it SHOULD treat that manifest as a description of a distinct
+        application, even if it is served from the same URL as that of another
+        application. When the user agent sees a manifest with an [=identity=]
+        matching that of an already-installed application, it SHOULD be used as
+        a signal that this manifest is a replacement for the already-installed
+        application's manifest, and not a distinct application, even if it is
+        served from a different URL than the one seen previously.
+        </p>
+        <p>
+        The [=identity=] is considered matching when the processed |manifest|["id"] [=url/equal|equals=].

sounds good, thanks!

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