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The random() CSS function chooses a random numeric value within a specified range. This allows for dynamic, randomized styling using CSS.

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 Values and Units Module Level 5 (#random), from Cascading Style Sheets (CSS) Working Group (W3C).

Browser support

Chrome ❌
Chrome Android ❌
Edge ❌
Firefox ❌
Firefox for Android ❌
Safari 26.2 Released on 2025-12-12
Safari on iOS 26.2 Released on 2025-12-12

Web Platform Tests (WPT)

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