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Test Info:
<html>
<head>
<script type="text/javascript">
function boom()
{
document.getElementById("d").focus();
document.execCommand("inserthtml", false, "AB");
document.execCommand("delete", false, null);
document.execCommand("undo", false, null);
document.addEventListener("DOMCharacterDataModified", f);
document.execCommand("redo", false, null);
document.removeEventListener("DOMCharacterDataModified", f);
function f()
{
document.removeEventListener("DOMCharacterDataModified", f);
document.execCommand("formatBlock", false, "<h3>");
}
}
</script>
</head>
<body onload="boom();"><div id="d" contenteditable="true"></div></body>
</html>