Thanks for sending this Jonathan.
I filed a bug for DevTools support as this might break a few things, and we 
could provide some debugging capability to users: 
https://bugzilla.mozilla.org/show_bug.cgi?id=1996533 

On Monday, October 27, 2025 at 10:36:02 AM UTC+1 [email protected] wrote:

> As of Firefox 146, I intend to turn on support for the CSS 
> contrast-color() function on all platforms.
>
> Summary: The contrast-color() CSS function picks a color that has 
> guaranteed contrast against a specified foreground or background color. 
> A typical use could be to ensure visibility of text over a background 
> color that varies depending on a user's chosen theme, without having to 
> explicitly specify an appropriate text color for every background option.
>
> Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1682439
>
> Specification: https://drafts.csswg.org/css-color-5/#contrast-color
>
> Standards Body: CSS Working Group
>
> Platform coverage: All
>
> Preference: layout.css.contrast-color.enabled
>
> DevTools bug: n/a
>
> Link to standards-positions discussion: n/a
>
> Other browsers:
>   Blink: some work in https://issues.chromium.org/issues/40142548, 
> looks currently incomplete
>   WebKit: shipped (Safari 26)
>
> web-platform-tests:
>   Existing tests: 
>
> https://wpt.fyi/results/css/css-color?label=master&label=experimental&aligned&q=contrast-color
>   Additional rendering test to be added alongside the Gecko 
> implementation in bug 1682439
>
>
> - JK
>

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