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Test Info:

<script>
function go() {
var a = document.createElement("e")
document.body.appendChild(a)
a.addEventListener("DOMSubtreeModified", () => {
c.src = ""
d.replaceWith(b)
f.srcdoc = ""
})
document.execCommand("selectAll", false)
a.setAttribute("s", "")
}
</script>
<div>
<output id="b"></output>
<iframe id="c" sandbox="allow-same-origin"></iframe>
<ul contenteditable="true">
<li id="d">A</li>
</ul>
<iframe id="f"></iframe>
<audio onloadstart="go()" src="">