`, `rgb(from rebeccapurple 0 0 0)`, `rgb(0, 0, 0)`);
    test_valid_value(`color`, `rgb(from rebeccapurple 0 0 0 / 0)`, `rgba(0, 0, 0, 0)`);
    test_valid_value(`color`, `rgb(from rebeccapurple 0 g b / alpha)`, `rgb(0, 51, 153)`);
    test_valid_value(`color`, `rgb(from rebeccapurple r 0 b / alpha)`, `rgb(102, 0, 153)`);
    test_valid_value(`color`, `rgb(from rebeccapurple r g 0 / alpha)`, `rgb(102, 51, 0)`);
    test_valid_value(`color`, `rgb(from rebeccapurple r g b / 0)`, `rgba(102, 51, 153, 0)`);
    