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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\21B9"}</style>
</head>
<body>
  <h1>Bidirectional arrow block (â†¹) in HTML</h1>
  <p>Using Hex Code: &#x21B9;</p>
  <p>Using HTML Code: &#8633;</p>
  <p id=point>Using CSS Entity: </p>
</body>
</html>

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HTML Entity for Bidirectional Arrow Block (↹)