random()Limited availability
The random() CSS function chooses a random numeric value within a specified range. This allows for dynamic, randomized styling using CSS.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
✕Not supportedup to 155
Current: 155Edge
✕Not supportedup to 154
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
1–26.1Not supported
26.2+Supportedsince Dec 12, 2025
Current: 27MobileChrome Android
✕Not supportedup to 155
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
1–26.1Not supported
26.2+Supportedsince Dec 12, 2025
Current: 27How to use
Not supported in Chrome, Edge, Firefox, Chrome Android, Firefox Android. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: random.
Feature detection
There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.