https://drafts.fxtf.org/css-masking-1/#the-mask-mode should not have a value called 'auto' since it makes parsing the mask shorthand ambiguous, and https://drafts.fxtf.org/css-masking-1/#the-mask-size (which takes the same values as background-size) already has a value called 'auto'. The current 'auto' value needs a new name that isn't used by any of the other properties in the shorthand.
-David -- 𝄞 L. David Baron http://dbaron.org/ 𝄂 𝄢 Mozilla https://www.mozilla.org/ 𝄂 Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
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