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<script>
function go() {
document.scrollingElement.addEventListener("DOMNodeInserted", () => {
document.execCommand("selectAll", false);
document.execCommand("insertOrderedList", false);
});
a.appendChild(document.createElement("e"));
}
</script>
<body onload=go()>
<meter contenteditable="true">
<dialog>
<style id="a"></style>
</dialog>
</meter>