 `hwb(from rebeccapurple 0 0% 0% / 0)`, `rgba(255, 0, 0, 0)`);
    test_valid_value(`color`, `hwb(from rebeccapurple 0deg 0% 0% / 0)`, `rgba(255, 0, 0, 0)`);
    test_valid_value(`color`, `hwb(from rebeccapurple 0 w b / alpha)`, `rgb(153, 51, 51)`);
    test_valid_value(`color`, `hwb(from rebeccapurple 0deg w b / alpha)`, `rgb(153, 51, 51)`);
    test_valid_value(`color`, `hwb(from rebeccapurple h 0% b / alpha)`, `rgb(77, 0, 153)`);
    test_valid_value(`color`, `hwb(from rebeccapurple h w 0% / alpha)`, `rg