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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var a = document.createElement("select");
var f = document.createElement("optgroup");
var g = document.createElement("optgroup");
a.appendChild(f);
g.appendChild(document.createElement("option"));
f.appendChild(g);
a.appendChild(document.createElement("option"));
document.body.appendChild(a);
}
</script>
</head>
<body onload="boom();"></body>
</html>