Document <input type=color> serialization w/ colorspace & alpha

[Elchi3]

Description

<input type=color> changed quite a bit. It now allows more than just hexadecimal values. You can now have alpha components as well as color spaces.

Motivation

Fix outdated docs.

Additional details

Spec: https://html.spec.whatwg.org/multipage/input.html#color-state-(type=color)
Blog post: https://webkit.org/blog/16900/p3-and-alpha-color-pickers/

Related issues and pull requests

Fixes #35953
BCD: mdn/browser-compat-data#27260

[github-actions]

Preview URLs

• /en-US/docs/Web/API/HTMLInputElement/alpha
• /en-US/docs/Web/API/HTMLInputElement/colorSpace
• /en-US/docs/Web/API/HTMLInputElement
• /en-US/docs/Web/HTML/Reference/Elements/input/color

Flaws (4)

Note! 2 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/API/HTMLInputElement
Title: HTMLInputElement
Flaw count: 3

• macros:
  • Can't resolve /en-US/docs/Web/API/HTMLInputElement/align
  • Can't resolve /en-US/docs/Web/API/HTMLInputElement/incremental
  • Can't resolve /en-US/docs/Web/API/HTMLInputElement/useMap

---

URL: /en-US/docs/Web/HTML/Reference/Elements/input/color
Title: <input type="color">
Flaw count: 1

• unknown:
  • must be provided

(comment last updated: 2025-08-19 20:10:56)

[github-actions]

This pull request has merge conflicts that must be resolved before it can be merged.

[estelle]

we might want to add a link to color from the color space glossary page

[Elchi3]

Thanks for your review, Estelle! I made some tweaks, what do you think?

[estelle]

i edited the two suggestions i originally made that you responded to; i think they'll be acceptable to commit now. Otherwise, good to go.

[Josh-Cena]

Nice