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<!doctype html>
<html class="test-wait">
<head>
<meta charset="utf-8">
<script>
var count = 0;
function onError() {
if (++count > 2) {
document.documentElement.removeAttribute("class");
return;
}
const object = document.getElementById("a");
const mi = document.getElementById("b");
object.data = "";
object.appendChild(document.getElementById("c"));
mi.appendChild(document.getElementById("c"));
getSelection().collapse(document.getElementById("c"), 0);
document.execCommand("undo");
document.execCommand("insertHorizontalRule");
}
</script>
</head>
<body>
<textarea id="c">a</textarea>
<dt contenteditable="true">
<mi id="b">#</mi>
<object id="a" onerror="onError()">
</object>
</dt>
</body>
</html>
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