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HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Underscore (_)</title>
  <style>
    #point::after {
      content: "\5F";
    }
  </style>
</head>
<body>
  <p>Using Hex Code: &#x5F;</p>
  <p>Using HTML Code: &#95;</p>
  <p>Using Named Entity: &lowbar;</p>
  <p id="point">Using CSS Entity: </p>
  <p><code>user_name</code></p>
</body>
</html>

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HTML Entity for Underscore (_)