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<script>
document.documentElement.appendChild(document.createElement("meter"))
a = document.createElement("textarea")
document.documentElement.appendChild(a)
b = document.createElement("style")
b.appendChild(document.createTextNode("*::-moz-meter-bar { text-indent: calc(50%); scroll-behavior: smooth; transition-duration: 250ms; }"))
a.select()
document.head.appendChild(b)
</script>