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Test Info:

<script>
addEventListener("DOMContentLoaded", () => {
document.querySelector("iframe").contentDocument.body.appendChild(
document.querySelector("span")
);
document.documentElement.style.display = "none";
})
</script>
<hgroup>
<audio controls>
</audio>
<iframe></iframe>
<span contenteditable></span>
</hgroup>
<textarea autofocus>