- From: Munira via GitHub <noreply@w3.org>
- Date: Tue, 29 Jul 2025 10:34:42 +0000
- To: public-css-archive@w3.org
tursunova has just created a new issue for https://github.com/w3c/csswg-drafts:
== Defining `@custom-media` inside conditional at-rules ==
Currently [Media Queries Level 5 spec](https://www.w3.org/TR/mediaqueries-5) allows [custom media queries](https://www.w3.org/TR/mediaqueries-5/#custom-mq) to be defined within other at-rules, including conditional rules like `@media`. This creates a logical paradox where a custom media query can be used in a condition before it has been defined, leading to a circular dependency that cannot be resolved. For example:
```
@media (color) and (--custom) {
@custom-media --custom (max-width: 300px);
...
}
```
Proposing to explicitly disallow `@custom-media` rules from being defined inside any conditional group rules (e.g., `@media`, `@supports`), attempting to use `@custom-media` inside conditional at-rules will make custom media queries fail to be defined.
Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/12536 using your GitHub account
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Received on Tuesday, 29 July 2025 10:34:42 UTC