Hello,

Similar to the other W3C bugs, none of this code is invalid. The validator is testing for "CSS Level 3" code, but all of this is beyond that.

1. The first line just changes the value depending on if light or dark mode is used.

2. The validator doesn't understand color-mix, which is causing this alert.

3. The validator doesn't understand container queries, causing this alert.

4. Again, the validator doesn't understand color-mix

Not a bug 🙂

Changed Status to Not a bug