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Test Info:
<script>
function onLoad() {
// For emulating the traditional behavior, collapse Selection to end of the
// text node in the <option> which is in the last child of the <body>.
const option = document.querySelector("option");
getSelection().collapse(option.firstChild, option.firstChild.length);
document.querySelector("ins").addEventListener(
"DOMNodeRemoved",
onDOMNodeRemoved
);
getSelection().setPosition(
document.querySelector("shadow")
);
document.execCommand("insertText", false, "1");
}
function onDOMNodeRemoved() {
document.execCommand("insertHorizontalRule");
document.execCommand("justifyCenter");
}
</script>
<body onload="onLoad()">
<li contenteditable>
<shadow>
<ins>
<option>
</li></shadow></ins></option></body>