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Test Info:

<script>↩
function go() {↩
a.appendChild(c)↩
a.getRootNode().addEventListener("DOMSubtreeModified", eh, { once: true })↩
b.setAttribute("oninvalid", "eh()")↩
}↩
function eh() {↩
b.setAttribute("role", "dialog")↩
window.scrollBy(0.802, 0.384)↩
var x = document.getSelection()↩
x.extend(a)↩
x.modify("move", "forward", "lineboundary")↩
a.style.setProperty("column-span", "all")↩
}↩
</script>↩
<body onload=go()>↩
<select>↩
<option id="a" contenteditable="true">x</span>↩
<input id="b">↩
<textarea id="c">↩