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Test Info:

<html>
<head>
<script type="text/javascript">
function boom()
{
document.getElementById("o").appendChild(document.createTextNode('d'));
document.body.offsetHeight;
document.getElementById("b").firstChild.data = "\u202E";
document.getElementById("a").firstChild.data = "ZZZZZZZ";
}
</script>
</head>
<body onload="boom();" style="font-family: monospace; width: 8ch;">
<div><span id="o"><span id="a">a</span><span id="b">b&#x202E;</span><span> c </span></span></div>
</body>
</html>