Web features explorer - alpha()

Web features explorer

The alpha() CSS function computes a relative color value by adjusting the opacity of an origin color.

Browser support

Chrome 151 Released on 2026-07-28
Chrome Android 151 Released on 2026-07-28
Edge 151 Released on 2026-07-31
Firefox Not supported
Firefox for Android Not supported
Safari Not supported
Safari on iOS Not supported

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 Color Module Level 5 (#relative-alpha), from Cascading Style Sheets (CSS) Working Group (W3C).

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