Re: [csswg-drafts] [css-color-3] opacity should use <<number>> not <<alphavalue>> “which is syntactically a <<number>>” (#3139)

ping @fantasai @tabatkins @AmeliaBR do we:

1. remove `<alphavalue>` and replace it with `<number> | <percentage>`
2. define `<alphavalue>` as `<number> | <percentage>` (and do what to make animations work)?

I'd like to close off this issue, get Color 4 updated and Color 3 errata'ed.

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