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Test Info:

<!DOCTYPE html>
<html>
<head>
<script type="application/javascript">
document.designMode = "on";
let selection = window.getSelection();
let foo = document.createElement('foo');
let div = document.createElement('div');
document.documentElement.appendChild(foo);
document.documentElement.appendChild(div);
foo.outerHTML = '<foo>';
let range = document.createRange();
range.selectNode(div);
selection.addRange(range);
range.setStart(foo, 0);
range = document.createRange();
range.selectNode(document.documentElement);
selection.addRange(range);
document.execCommand('insertparagraph', false, null);
</script>
</head>
<body>
</body>
</html>