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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<script>
window.onload = () => {
a = document.createElement("x")
document.documentElement.appendChild(a)
b = document.createElement("span")
document.documentElement.appendChild(b)
document.documentElement.getBoundingClientRect()
a.appendChild(document.createElement('div'))
b.innerText = "\uFDDE\r\u0301\n"
}
</script>