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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
window.onload = () => {
a = document.createElement("p")
document.documentElement.appendChild(a)
a.animate([])
document.designMode = 'on'
document.documentElement.appendChild(document.createElement("div"))
}
</script>
</head>
</html>