This GitHub issue is for collecting web developer signals for alpha().
The alpha() CSS function computes a relative color value by adjusting the opacity of an origin color.
Browser support
- Chrome 151 (Jul 28, 2026)
- Chrome Android 151 (Jul 28, 2026)
- Edge 151 (Jul 31, 2026)
- Firefox 155 (Sep 1, 2026)
- Firefox for Android 155 (Sep 1, 2026)
- Safari: not supported
- Safari on iOS: not supported
Give us feedback
If you're pressed for time, but you want this feature to be available in all browsers, please give this issue a thumbs up 👍 reaction.
However, a much better guide for us is to know how you'd use this feature, and what you're having to do in the meantime. This helps us judge the priority versus other features.
Copy the template below in a comment, and add the details that matter to you.
## What I want to do with this feature
<!-- Add your specific use-cases, even if they seem obvious to you. -->
## What I'm having to do in the meantime
<!--
Are you having to use another feature instead, a polyfill, or is it blocking you completely?
Why are the alternatives worse than using this feature?
-->
All comments are expected to adhere to the Code of Conduct.
Learn more
You can learn more about this feature here:
This GitHub issue is for collecting web developer signals for alpha().
The
alpha()CSS function computes a relative color value by adjusting the opacity of an origin color.Browser support
Give us feedback
If you're pressed for time, but you want this feature to be available in all browsers, please give this issue a thumbs up 👍 reaction.
However, a much better guide for us is to know how you'd use this feature, and what you're having to do in the meantime. This helps us judge the priority versus other features.
Copy the template below in a comment, and add the details that matter to you.
All comments are expected to adhere to the Code of Conduct.
Learn more
You can learn more about this feature here: