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Test Info:

<html class="reftest-wait">
<head>
<script>
function boom()
{
document.body.offsetHeight;
var fivediv = document.getElementById("five");
var parent = fivediv.parentNode;
for (var i = 3; i <= 4; i++) {
var newdiv = document.createElement("div");
newdiv.appendChild(document.createTextNode(i));
parent.insertBefore(newdiv, fivediv);
}
var fivedeediv = document.getElementById("fivedee");
parent = fivedeediv.parentNode;
var newdiv = document.createElement("div");
newdiv.appendChild(document.createTextNode("5b"));
parent.insertBefore(newdiv, fivedeediv);
newdiv = document.createElement("div");
newdiv.appendChild(document.createTextNode("5c"));
parent.insertBefore(newdiv, fivedeediv);
document.body.offsetHeight;
document.documentElement.className = "";
}
</script>
</head>
<body onload="boom();">
<div>1</div>
<div>2</div>
<div id="five">
<div>5a</div>
<div id="fivedee">5d</div>
</div>
<div>6</div>
<div>7</div>
<div>8</div>
<div>9</div>
</body>
</html>