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<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h3>Tooltip Options</h3>
  <p>The <strong>html</strong> option specifies whether to accept HTML tags in the tooltip.</p>
  <button class="btn btn-success btn-md">Hover over me</button>
</div>

<script>
$(document).ready(function(){
    $('.btn').tooltip({title: "<h1><strong>HTML</strong> inside <code>the</code> <em>tooltip</em></h1>", html: true, placement: "bottom"}); 
});
</script>

</body>
</html>