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HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Left Right Double Arrow (⇔)</title>
  <style>
    #point::after {
      content: "\21D4";
    }
  </style>
</head>
<body>
  <p>Using Hex Code: &#x21D4;</p>
  <p>Using HTML Code: &#8660;</p>
  <p>Using Named Entity: &hArr;</p>
  <p id="point">Using CSS Entity: </p>
  <p><code>P &hArr; Q</code></p>
</body>
</html>

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HTML Entity for Left Right Double Arrow (⇔)