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Test Info:

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function boom()
{
var a = document.documentElement;
var b = document.body;
document.removeChild(a);
b.contentEditable = "true";
document.appendChild(a);
function t() {
document.removeEventListener("DOMAttrModified", t);
document.removeChild(a);
}
document.addEventListener("DOMAttrModified", t);
document.execCommand("insertunorderedlist", false, "<h1>");
document.removeEventListener("DOMAttrModified", t);
}
</script>
</head>
<body onload="boom()"></body>
</html>