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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<script type="application/javascript">
var target = document.createElement("div");
target.foo = 'bar';
var observer = new IntersectionObserver(function () { });
observer.observe(target);
observer.unobserve(target);
observer = null;
target = null;
</script>
</head>
</html>