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Test Info:

<script id="a">↩
function go() {↩
a.appendChild(b)↩
document.execCommand("indent", false)↩
document.execCommand("delete", false)↩
}↩
</script>↩
<body onload=go()>↩
<ul contenteditable="true">↩
<li id="b" contenteditable="false">↩
<textarea autofocus>↩