Re: [csswg-drafts] [css-mixins-1] When does (custom) `env()` resolve? (#12676) from andruud via GitHub on 2025-08-29 (public-css-archive@w3.org from August 2025)

From: andruud via GitHub <noreply@w3.org>
Date: Fri, 29 Aug 2025 09:17:22 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-3236341822-1756459040-noreply@w3.org>

If they substitute `@apply` time, they won't automatically interact well with features that "act" on IACVT, for example:

```
@mixin --m() {
  & {
    color: first-valid(env(--invalid), var(--thing));
  }
}
```
I think we'd need to add a CSS-wide keyword (`guaranteed-invalid`?) and have `env()` resolve to that.

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Received on Friday, 29 August 2025 09:17:23 UTC