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<script>
document.addEventListener('DOMContentLoaded', () => {
let a = document.documentElement
SpecialPowers.wrap(self).printPreview().document.adoptNode(a)
let b = document.createElementNS('http://www.w3.org/1999/xhtml', 'optgroup')
a.appendChild(b)
b.focus({ })
})
</script>
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