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

> This isn't (really) anything to do with parallax or dead zone vs safe zone. You can simply think of it as Android's "safe zone" is much smaller than the "safe zone" we defined in this spec (the web spec safe zone is 80% diameter, while Android's safe zone is 61% diameter). That's fine, it just means the image needs to be padded to display correctly on Android. It didn't make sense to have the web spec exactly match Android (the web is bigger than just Android).

Oops. I think I was assuming all the pixels on the provided icon to be non-transparent, in which case it would be difficult for user-agents to add additional padding.
That doesn't look like the case from the sample at https://w3c.github.io/manifest/#icon-masks

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