HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>
    #point::after {
      content: "\00B2";
    }
  </style>
</head>
<body>

  <h1>Superscript Digit Two (²) in HTML</h1>

  <p>Using Hex Code: &#x00B2;</p>
  <p>Using HTML Code: &#178;</p>
  <p>Using Named Entity: &sup2;</p>
  <p id="point">Using CSS Entity: </p>

  <p>Examples: x², m², km²</p>
  <p>Semantic alternative: x<sup>2</sup></p>

</body>
</html>

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HTML Entity for Superscript Digit Two (²)