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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var frame = document.getElementById("f");
var frameRoot = frame.contentDocument.documentElement;
document.body.removeChild(frame);
var i = document.createElementNS("http://www.w3.org/1999/xhtml", "input");
i.setAttribute("autofocus", "true");
frameRoot.appendChild(i);
}
</script>
</head>
<body onload="boom();"><iframe id="f" src="data:text/html,"></iframe></body>
</html>