Re: [w3c/manifest] Add a 'masking' purpose, for allowing the UA to supercompose such icons (#657)

kenchris commented on this pull request.



> +          zone</dfn>, which is defined as a circle with center point in the
+          center of the icon and with a radius of 2/5 (40%) of the icon size,
+          which means the smaller of the icon width and height, in case the
+          icon is not rectangular.
+        </p>
+        <figure>
+          <img src="images/safe-zone.svg" width="340" height="340" alt=
+          "safe zone illustrated">
+          <figcaption>
+            The safe zone is a centrally positioned circle, with radius 2/5
+            (40%) of the minimum of the icon's width and height.
+          </figcaption>
+        </figure>
+        <p>
+          All pixels in this zone are guaranteed to be seen in all masks.
+          Pixels outside the safe zone are not guaranteed (but can) be visible

added

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