_value(`color`, `color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r r r / r)`,                    `color(${colorSpace} 0.7 0.7 0.7 / 0.7)`);
        test_valid_value(`color`, `color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} alpha alpha alpha / alpha)`,    `color(${colorSpace} 0.4 0.4 0.4 / 0.4)`);

        // Testing out of gamut components.
        test_valid_value(`color`, `color(from color(${colorSpace} 1.7 1.5 1.3) ${colorSpace} r g b)`,                              `color