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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
window.onload = function () {
var childDocument = document.getElementsByTagName("iframe")[0].contentDocument;
childDocument.designMode = "on";
function onAttrModified(aEvent) {
childDocument.removeEventListener("DOMAttrModified", onAttrModified);
// Remove the editor from document during executing "insertOrderedList".
document.body.innerHTML = "";
}
childDocument.addEventListener("DOMAttrModified", onAttrModified);
childDocument.execCommand("insertOrderedList", false, "1");
}
</script>
</head>
<body><iframe></iframe></body>
</html>