Re: [w3c/manifest] Added security consideration advice for out-of-scope UI spoofing. (#748)

@christianliebel commented on this pull request.



> @@ -532,6 +532,19 @@ <h3 id="navigation-scope-security-considerations">
           security reasons. It ensures that users are always aware of which
           <a>origin</a> they are interacting with.
         </p>
+        <p>
+          Despite this, there is still a potential spoofing risk, if an
+          installed app pretends to navigate to an out-of-scope site on another
+          <a>origin</a>. The site shows a fake version of the user agent's
+          prominent out-of-scope UI, indicating to the user that it is on
+          another origin, while in reality, the user has never navigated away
+          from the installed app's origin, and the user agent is not showing
+          any out-of-scope UI. User agents MAY wish to ensure that the
+          out-of-scope UI is not shown in a location that can be spoofed by the
+          installed app when the UI is not being shown. However, due to the
+          nature of the user agent's UI being minimal or non-existent for
+          installed apps, this may not be possible.

Yes, this might just shift the problem… I'd suggest to keep it as it is.

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