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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function onLoad() {
const editingHost = document.querySelectorAll("div[contenteditable]");
// For emulating the traditional behavior, collapse Selection to end of the
// last <div contenteditable> which is the deepest last child of the <body>.
getSelection().collapse(editingHost[1], editingHost[1].childNodes.length);
getSelection().removeAllRanges();
const r = document.createRange();
r.setStart(editingHost[0], 1);
r.setEnd(editingHost[1], 0);
getSelection().addRange(r);
document.execCommand("insertOrderedList");
}
</script>
</head>
<body onload="onLoad();"><div contenteditable>a</div><div contenteditable></div></body>
</html>