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<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h2>Badge</h2>
  <p>The .badge class indicates new or unread items (will automatically collapse when there are no new or unread items, via CSS's :empty selector):</p>                  
  <p><a href="#">Inbox <span class="badge">17</span></a></p>                                    
</div>
</body>
</html>