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<script>
window.onload = () => {
b.style.setProperty("text-decoration", "overline underline line-through")
b.appendChild(a)
document.execCommand("selectAll", false)
window.getSelection().extend(b, 0)
document.execCommand("underline", false)
}
</script>
<ins contenteditable="true">
a
<meta id="b"></meta>
<font id="a">