from color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z) ${colorSpace} x y z)`,        `color(${resultColorSpace} 7 -20.5 100)`);

        // Testing replacement with 0.
        test_valid_value(`color`, `color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} 0 0 0)`,                              `color(${resultColorSpace} 0 0 0)`);
        test_valid_value(`color`, `color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} 0 0 0 / 0)`,                          `color(${resultColorSpace} 0 0