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Test Info:

<html id="a"><script type="text/javascript" id="__gaOptOutExtension">window["_gaUserPrefs"] = { ioo : function() { return true; } }</script><head>↩
<meta http-equiv="content-type" content="text/html; charset=windows-1252"><script>↩
function go() {↩
b.addEventListener("DOMCharacterDataModified", () => {↩
a.appendChild(b)↩
})↩
document.execCommand("delete", false)↩
}↩
function eh() {↩
b.reset()↩
}↩
</script>↩
</head><body onload="go()">↩
<details ontoggle="eh()" open="">↩
<dt contenteditable="">↩
</dt>↩
</details><aside style="position: fixed; top: 0px; right: 0px; font-family: &quot;Lucida Console&quot;, monospace; background-color: rgb(242, 230, 217); padding: 3px; z-index: 10000; text-align: center; max-width: 120px; opacity: 0; transition: opacity 0.5s linear 0s;">1194 x 73</aside></body><form id="b"><keygen>↩
<button autofocus="">↩
</button></form></html>