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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">
<script>
function boom()
{
var root = document.documentElement;
while(root.firstChild) { root.firstChild.remove(); }
root.appendChild(document.createElement("body"));
root.offsetHeight;
var bigText = document.createTextNode("");
bigText.data += "\u202D";
bigText.data += "A";
bigText.data += "\x1C";
bigText.data += "\u062A";
bigText.data += "E";
bigText.data += "\u062E";
bigText.data += " ";
bigText.data += "\u202D";
bigText.data += "X";
bigText.data += "\x1C";
bigText.data += "Y";
root.appendChild(bigText);
var smallText = document.createTextNode("Z");
root.appendChild(smallText);
root.focus();
function del()
{
var range = document.createRange();
range.setStart(root, 0);
range.setEnd(bigText, bigText.data.length);
range.deleteContents();
}
del();
function finish() {
document.documentElement.removeAttribute('class');
}
setTimeout(finish, 0);
}
</script>
</head>
<body onload="boom();"></body>
</html>