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Test Info:
<script>
function onLoad() {
const pre = document.querySelector("pre[contenteditable]");
// For emulating the traditional behavior, collapse Selection to end of the
// text node at end of the <pre> which is the deepest last child of the
// <body>, i.e., end of the text node after the <input>.
getSelection().collapse(pre.lastChild, pre.lastChild.length);
document.querySelector("li").setAttribute("contenteditable", "true");
pre.addEventListener("DOMNodeRemoved", onDOMNodeRemoved);
pre.appendChild(
document.querySelector("input")
);
}
function onDOMNodeRemoved() {
document.body.appendChild(
document.querySelector("pre[contenteditable]")
);
document.execCommand("justifyFull");
document.execCommand("delete");
}
</script>
<body onload="onLoad()">
<li>
A
<pre contenteditable>
<input autofocus>
</pre></li></body>