HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2082"}</style>
</head>
<body>
  <h1>Subscript Digit Two (₂) in HTML</h1>
  <p>Using Hex Code: &#x2082;</p>
  <p>Using HTML Code: &#8322;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Example formulas: H₂O, CO₂, O₂</p>
</body>
</html>

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HTML Entity for Subscript Digit Two (₂)