<!DOCTYPE html><!-- webkit-test-runner [ SystemPreviewEnabled=false ] -->
<body>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>

test(() => {
    assert_false(document.createElement("a").relList.supports("ar"));
}, `a.relList.supports("ar") should be false when SystemPreviewEnabled is false.`);

</script>
</body>