ata-color=333></div>
<div id="expected"></div>

<script>
    var elem = document.getElementById("test");
    var value = window.getComputedStyle(elem).getPropertyValue("background-color");

    var expected_elem = document.getElementById("expected");
    var expected_value = window.getComputedStyle(expected_elem).getPropertyValue("background-color");
    test(() => {
        assert_not_equals(value, expected_value);
    });
</script>