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<script>
window.onload = () => {
a = document.createElement("p")
document.documentElement.appendChild(a)
b = document.createElement("caption")
document.documentElement.appendChild(b)
a.insertAdjacentHTML("afterEnd", "<audio controls></audio><iframe>");
document.documentElement.getBoundingClientRect()
document.documentElement.appendChild(document.createElement("tr"))
b.style.borderCollapse = "collapse"
}
</script>