- From: Tim Nguyen via GitHub <noreply@w3.org>
- Date: Tue, 27 Jan 2026 14:44:33 +0000
- To: public-css-archive@w3.org
> In my opinion, `background-size` and `mask-size` should serialize with two values when they are identical, except if they are `auto`, while `webkit-background-size` should serialize with two values when the second is `auto` (edit) except if the first is also `auto`. Note that we can't serialize `-webkit-background-size` and `background-size` as they're aliased. > Seems like the assertions about what webkit does are different from the WPTs, when the mask-size or background-size is auto. https://github.com/web-platform-tests/wpt/blob/master/css/css-masking/parsing/mask-size-valid.html#L19 asserts that auto auto serializes to auto rather than to auto auto. Ah, there's no ambiguity in this case I think (though I could be wrong), so hence the single value. I haven't looked at this in a while tbh -- GitHub Notification of comment by nt1m Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/7802#issuecomment-3805627767 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config
Received on Tuesday, 27 January 2026 14:44:34 UTC