Re: [csswg-drafts] [css-values-5] Arbitrary substitution function definition is ambiguous (#13083)

I would like to make sure that you want to leave this point unspecified... :

  > An ASF cannot provide parts of the argument grammar of an outer ASF

... as it is not covered by the PR fixing this issue, unless I am missing something.

Authors might use this:

```css
div {
  --fallback: , green;
  color: var(--color var(--fallback)); /* invalid */
}
```

Why should it be invalid?

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Received on Friday, 14 November 2025 07:32:15 UTC