named-feature()Limited availability
The named-feature() function, when used with @supports, checks if a named CSS behavior is supported. The CSS behavior names are defined by specification. For example, @supports named-feature(anchor-position-follows-transforms) checks whether anchor-positioning applies after transforms."
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–149Not supported
150+Supportedsince Jun 30, 2026
Current: 155Edge
12–149Not supported
150+Supportedsince Jul 2, 2026
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–149Not supported
150+Supportedsince Jun 30, 2026
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 — see the links below.
Feature detection
There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.