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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
var count = 0;
function boom()
{
var r = document.body; while(r.firstChild) { r.removeChild(r.firstChild); }
document.body = document.createElementNS("http://www.w3.org/1999/xhtml", "body");
var div = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
var span = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
span.setAttributeNS(null, "contenteditable", "true");
document.documentElement.appendChild(span);
(document.body || document.documentElement).appendChild(div);
var text = document.createTextNode("\u200F\uE8D4");
document.body.appendChild(text);
document.documentElement.appendChild(document.body);
document.documentElement.offsetHeight;
text.data += "\uF0C5";
document.execCommand("selectAll", false, null);
if (++count < 20)
setTimeout(boom, 0);
}
</script>
</head>
<body onload="boom();"></body>
</html>