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

From: Tab Atkins Jr. via GitHub <sysbot+gh@w3.org>
Date: Thu, 10 Sep 2020 16:37:17 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-690472422-1599755836-sysbot+gh@w3.org>
Agreed; I think it's useful to leave it as a production to ensure consistency.

Animation isn't an issue; animations drill down to the base values of any production to figure out how to animate if needed.

Note, tho, that you can't animate between `number` and `percentage` naively, because they can't be combined in `calc()`. We should probably specially define this to allow animation with them, since they're equivalent - either converting both to a number or both to a percentage. We can reuse the language from <https://drafts.csswg.org/css-values/#combine-numbers> et al.

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