Re: [csswg-drafts] [css-backgrounds] Always serialize 'background-size' and `mask-size` as two values (#7802)

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`.

So IMO the correct wording would be to serialize to two values when they are not identical, even if the second one is the default.

@weinig @nt1m 

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Received on Tuesday, 27 January 2026 11:22:30 UTC