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<script>
function go() {
document.execCommand("justifyFull", false)
document.execCommand("selectAll", false)
window.top.addEventListener("DOMNodeRemoved", eh)
document.execCommand("heading", false, "H1")
}
function eh() {
document.execCommand("insertHTML", false, undefined)
}
</script>
<body onload=go()>
<dd contenteditable="true">A
<!-- A -->