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The at-rule() function, when used with @supports, checks if a CSS at-rule is supported. For example @supports at-rule(@starting-style) checks if the @starting-style at-rule is supported.

Status

Limited availability

MDN documentation

No MDN documentation found. You can search for the feature on MDN. If you believe that MDN has no documentation about this feature, you can open an issue on MDN's GitHub repository.

Specifications

CSS Conditional Rules Module Level 5 (#typedef-supports-at-rule-fn), from Cascading Style Sheets (CSS) Working Group (W3C).

Browser support

Chrome ❌ See issues.chromium.org/issues/40211832
Chrome Android ❌
Edge ❌
Firefox ❌ Vendor position : unknown
Firefox for Android ❌ Vendor position : unknown
Safari ❌ Vendor position : unknown
Safari on iOS ❌ Vendor position : unknown

Developer votes

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