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

kenchris commented on this pull request.



> +        <p>
+          All pixels in this zone are guaranteed to be seen in all masks. What
+          is outside may be visible, but are not guaranteed to be so.
+        </p>
+        <p>
+          The user agent MAY apply a mask of any size, making any pixels that
+          are more than 2/5ths of the image size (minimum of width and height
+          if non-square) away from the center (the <a>safe zone</a>)
+          transparent.
+        </p>
+        <p>
+          The user agent MUST NOT make any pixel within the safe zone
+          transparent.
+        </p>
+        <p>
+          The user agent MAY enlarge the icon by adding additional padding.

Not sure

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