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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Math Subscripts</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:520px}</style>

</head>

<body>

  <p>

    The area (A<sub>1</sub>) of the first circle is smaller than the area (A<sub>2</sub>) of the second circle.

  </p>

</body>

</html>

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HTML sub Tag — Mathematical Notations