If relative color channels have calc() function and that calc() function contains values ​​with units or percentages, the color channels will not be handled correctly.

Valid:

• "rgb(from rebeccapurple calc(r * 2) g b)"
• "rgb(from rebeccapurple calc(r * 50%) g b)"

Invalid: The current css-color treats these values ​​as valid.

• "rgb(from rebeccapurple calc(r * 2rem) g b)"
• "rgb(from rebeccapurple calc(r + 50%) g b)"