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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
getSelection().collapse(document.querySelector("code[contenteditable]").firstChild, 0);
window.top.find("A");
document.querySelector("table").insertRow(1);
document.querySelector("table").insertRow(1);
document.execCommand("subscript");
document.execCommand("foreColor", false, "currentColor");
document.execCommand("insertHTML", false, document.querySelector("h5").outerHTML);
document.execCommand("subscript");
document.execCommand("foreColor", false, "currentColor");
document.execCommand("insertHTML", false, document.querySelector("h5").outerHTML);
document.execCommand("insertText", false, "A");
});
</script>
</head>
<body>
<table>
<tr>
<td>
<code contenteditable>
A
<h5>
</h5>
</code>
</body>
</html>