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

So a radius of 2/5 means that you have 10% non-safe padding on each side, where as the MS guidelines seems to indicate the need for 16% (1/3 in total of both sides).

So example for an android icon of size 192px, the safe zone would take up 4/5 (~= 154px) leaving a non-safe zone margin of 10%.

Windows seems to prefer a margin of around 16% for fullbleed tiles which is slightly more than 10%, but maybe not terrible much. As can be seem on their examples, some of the icon content actually paints outside the inner (2/3 of the image).

![image](https://user-images.githubusercontent.com/1101339/36724287-0a71f364-1bb3-11e8-972c-077fba4f1925.png)

So with 2/5 we end up recommending 10% non-safe padding around the safe area, which seems to be slightly less than what Windows recommends today, but still an improvement from what they have today.

Is this fine @boyofgreen ?


-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/manifest/pull/657#issuecomment-368828173