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

mgiuca commented on this pull request.



> +        <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.
+        </p>
+        <p>
+          If the icon contains transparent pixels, the user agent MUST composite
+          the icon onto a color (eg. white) of the user agent's choice.

nit: The word "solid" was dropped ("solid color"). Maybe you thought it was unnecessary. I don't mind either way.

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