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Test Info:

<!-- COMMENT -->
abc
<head>
<script>
document.addEventListener('DOMContentLoaded', () => {
// For emulating the traditional behavior, collapse Selection to end of the
// <em> which is the deepest last child of the <body> (at the comment node).
getSelection().collapse(
document.querySelector("em[contenteditable]"),
document.querySelector("em[contenteditable]").childNodes.length
);
document.execCommand("justifyLeft");
document.designMode = 'on';
document.execCommand("insertParagraph");
});
</script>
</head>
<h4>
<em contenteditable>
<big>
<button autofocus formnovalidate formtarget="">
</button>
<!-- COMMENT --></big></em></h4></body>