rom lch(0.7 45 30 / 40%) l c 25deg / alpha)`, `lch(0.7 45 25 / 0.4)`);
    test_valid_value(`color`, `lch(from lch(0.7 45 30 / 40%) l c h / .25)`, `lch(0.7 45 30 / 0.25)`);
    test_valid_value(`color`, `lch(from lch(0.7 45 30 / 40%) 200 300 400 / 500)`, `lch(100 300 40)`);
    test_valid_value(`color`, `lch(from lch(0.7 45 30 / 40%) -200 -300 -400 / -500)`, `lch(0 0 320 / 0)`);
    test_valid_value(`color`, `lch(from lch(0.7 45 30 / 40%) 50 120 400deg / 500)`, `lch(50 120 40)`);
    test_valid_value(`color