[css-color-adjust-1] Is forced color computed or used value? #4915
Description
Follow-up to #4175
We are now computing background-color based on the computed 'color' value. (Specifically, we're keying off the computed color to find a color, and forcing all but the author’s specified alpha channel to match that color.)
Is this computation at computed-value time or used-value time for background-color?