/ alpha)`, `oklch(0.7 0.45 0.25 / 0.4)`);
    test_valid_value(`color`, `oklch(from oklch(0.7 0.45 30 / 40%) l c 25deg / alpha)`, `oklch(0.7 0.45 25 / 0.4)`);
    test_valid_value(`color`, `oklch(from oklch(0.7 0.45 30 / 40%) l c h / .25)`, `oklch(0.7 0.45 30 / 0.25)`);
    test_valid_value(`color`, `oklch(from oklch(0.7 0.45 30 / 40%) 2 3 400 / 500)`, `oklch(2 3 40)`);
    test_valid_value(`color`, `oklch(from oklch(0.7 0.45 30 / 40%) -2 -3 -400 / -500)`, `oklch(0 0 320 / 0)`);
    test_valid_value(`color`