if()Limited availability
The if() CSS function is an inline conditional value that returns a value based on a set of conditions.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–136Not supported
137+Supportedsince May 27, 2025
Current: 155Edge
12–136Not supported
137+Supportedsince May 29, 2025
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–136Not supported
137+Supportedsince May 27, 2025
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: if.
Feature detection
There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.