HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>
    #point::after {
      content: "\0031";
    }
  </style>
</head>
<body>
  <h1>Digit One (1) in HTML</h1>
  <p>Digit One using Hex Code: &#x31;</p>
  <p>Digit One using HTML Code: &#49;</p>
  <p id="point">Digit One using CSS Entity: </p>
  <p>Typed directly: 1</p>
</body>
</html>

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HTML Entity for Digit One (1)