g-function", "cubic-bezier(1, 2, 3, 4, 5)");
test_invalid_value("transition-timing-function", "cubic-bezier(-0.1, 0.1, 0.5, 0.9)");
test_invalid_value("transition-timing-function", "cubic-bezier(0.5, 0.1, 1.1, 0.9)");

test_invalid_value("transition-timing-function", "steps(foobar)");
test_invalid_value("transition-timing-function", "steps(3.3, end)");
test_invalid_value("transition-timing-function", "steps(3, top)");
test_invalid_value("transition-timing-function", "steps(-3, top)");
test_invalid_value("tr