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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var root = document.documentElement;
while (root.firstChild) { root.firstChild.remove(); }
var body = document.createElementNS("http://www.w3.org/1999/xhtml", "body");
var div = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
root.contentEditable = "true";
root.appendChild(div);
root.removeChild(div);
root.insertBefore(body, root.firstChild);
window.getSelection().removeAllRanges();
var r0 = document.createRange();
r0.setStart(body, 0);
r0.setEnd(body, 0);
window.getSelection().addRange(r0);
var r1 = document.createRange();
r1.setStart(div, 0);
r1.setEnd(div, 0);
window.getSelection().addRange(r1);
document.execCommand("inserthtml", false, "1");
}
</script>
</head>
<body onload="boom();"></body>
</html>