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<!DOCTYPE HTML>
<html>
<head>
<script type="application/javascript">

// Crashes if 'target' doesn't get properly unlinked in nsINode::LastRelease

function crash() {
	var target = document.getElementById('target');
	var io = new IntersectionObserver(function () { }, { });
	io.observe(target);
	document.body.removeChild(target);
}

</script>
</head>
<body onload="crash()">
	<div id="target" style="background: red; width: 50px; height: 50px"></div>
</body>
</html>