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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var a = document.createElementNS("http://www.w3.org/1999/xhtml", "datalist");
var b = document.createElementNS("http://www.w3.org/1999/xhtml", "option");
a.appendChild(b);
b.expando = a.options;
}
</script>
</head>
<body onload="boom();"></body>
</html>