Re: [w3c/manifest] Breaking: Ignore any icon with no recognised purpose. (#741)

marcoscaceres commented on this pull request.



> @@ -2554,42 +2556,52 @@ <h3>
             The user agent is free to display the icon in any context.
           </dd>
         </dl>
+        <p class="note">
+          If an icon contains multiple purposes, it can be used for any of
+          those purposes. If all of the stated purposes are not recognized, the
+          icon is totally ignored. For example, if an icon has purpose

Ok, but then the algorithm takes care of dropping the unknown purposes on the floor. Doesn't that mean the SHOULD can go away? The reasoning being that a conforming user agent would have dropped the icons with unknwn purposes, and will only be left with a list of known icons to display.  

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