Re: [csswg-drafts] [css-flexbox-1] 9.2(3)(e) — used flex basis is not an optional substitution (#12017)

There’s no “reminder” here—referring to the *used flex basis* doesn’t imply a specific source for the size. As mentioned, the *used* flex basis can be derived either from the preferred main size or from the declared `flex-basis` value.

What you’re describing is an interpretation of “used flex basis” as necessarily referring to a *declared* value that overrides the preferred main size—but that’s problematic. All the other cases (A–D) are defined in terms of the *used* flex basis, which can originate from either source.

For example, case A refers to a definite used flex basis but doesn’t specify the source of that definite size—it could just as well come from `width: 10px` as from `flex-basis: 10px`.

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Received on Friday, 28 March 2025 21:33:14 UTC