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  <title>Footnote Reference</title>



  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}p{margin:0;font-size:1rem;max-width:420px}sup{font-size:.75em}</style>



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  <p>This is a sentence with a footnote<sup>1</sup>.</p>



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HTML sup Tag — Footnotes