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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
document.designMode = "on";
document.addEventListener("DOMNodeRemoved", () => {
document.documentElement.normalize();
document.designMode = "off";
});
getSelection().collapse(document.querySelector("address").firstChild, 1);
document.execCommand("insertHorizontalRule");
});
</script>
</head>
<body>
<address>
A
</address>
</body>
</html>