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Test Info:

<html class="reftest-wait">
<head>
<script>
function boom()
{
document.body.offsetHeight;
var fourdiv = document.getElementById("four");
var parent = fourdiv.parentNode;
var newdiv = document.createElement("div");
newdiv.appendChild(document.createTextNode("3"));
parent.insertBefore(newdiv, fourdiv);
document.body.offsetHeight;
document.documentElement.className = "";
}
</script>
</head>
<body onload="boom();">
<div>1</div>
<div>2</div>
<div id="four">4</div>
<div>5</div>
</body>
</html>