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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
addEventListener("load", () => {
document.documentElement.innerHTML = "<main>\n>";
document.addEventListener("DOMSubtreeModified", () => {
document.normalize();
}, {capture: true});
document.designMode = "on"
document.execCommand("insertParagraph");
});
</script>
</head>
</html>