`alpha` and `colorspace` attributes for `<input type=color>`

[github-actions]

This GitHub issue is for collecting web developer signals for `alpha` and `colorspace` attributes for `<input type=color>`.

The ability to control the opacity of a color picked using <input type="color"> and determine the colorspace of the selected color.

Browser support

• Chrome: not supported
• Chrome Android: not supported
• Edge: not supported
• Firefox: not supported
• Firefox for Android: not supported
• Safari 18.4 (Mar 31, 2025)
• Safari on iOS 18.4 (Mar 31, 2025)

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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

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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?
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Learn more

You can learn more about this feature here:

• web features explorer
• webstatus.dev
• Specification