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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom()
{
var frame = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
document.body.appendChild(frame);
var frameDoc = frame.contentDocument;
frameDoc.contentEditable = "true";
document.body.removeChild(frame);
SpecialPowers.gc();
frameDoc.focus();
}
</script>
</head>
<body onload="boom();"></body>
</html>
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