css/css-values/attr-IACVT.html

<!DOCTYPE html>
<title>CSS Values Test: attr() IACVT</title>
<meta name="assert" content="Fail to substitute attr() should be IACVT.">
<link rel="help" href="https://drafts.csswg.org/css-values-5/#attr-notation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
    #expected {
        background-color: red;
    }
    #test {
        background-color: red;
        background-color: attr(data-color type(<color>));
    }
</style>
<div id="test" data-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>