ue(`color`, `lch(from lch(.7 45 30) alpha c h / l)`, `lch(100 45 30 / 0.7)`);
    test_valid_value(`color`, `lch(from lch(.7 45 30) alpha c h / alpha)`, `lch(100 45 30)`);
    test_valid_value(`color`, `lch(from lch(.7 45 30) alpha c c / alpha)`, `lch(100 45 45)`);
    test_valid_value(`color`, `lch(from lch(.7 45 30 / 40%) alpha c h / l)`, `lch(40 45 30 / 0.7)`);
    test_valid_value(`color`, `lch(from lch(.7 45 30 / 40%) alpha c h / alpha)`, `lch(40 45 30 / 0.4)`);
    test_valid_value(`color`, `lch(from 