<html>
<body>
    <script>
        document.addEventListener("DOMContentLoaded", function () {
            document.execCommand("SelectAll", false);
            window.getSelection().deleteFromDocument();
            window.parent.postMessage('FINISH', '*');
        }, true);

        var count = 0;
        document.addEventListener("DOMSubtreeModified", function () {
            count++;
            if (count < 3) {
                var src = event.srcElement;
                src.contentEditable = "true";
                src.innerHTML = '<div></div>';
                document.execCommand('InsertOrderedList', false, false);
            }
        }, false);
    </script>
    <h5>
        aa
        <textarea></textarea>
    </h5>
    <dl>
        aa
    </dl>
</body>
</html>