Firefox 111 supports CSS 4 color functions(developer.mozilla.org)
developer.mozilla.org
Firefox 111 supports CSS 4 color functions
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/111
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CSS color functions color(), lab(), lch(), oklab(), and oklch() are now supported. These features are disabled by default and can be enabled by setting the preference layout.css.more_color_4.enabled to true.