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<!DOCTYPE html>
<html>
<head>
  <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">
  <h1>h1 Bootstrap heading <small>(36px)</small></h1>
  <h2>h2 Bootstrap heading <small>(30px)</small></h2>
  <h3>h3 Bootstrap heading <small>(24px)</small></h3>
  <h4>h4 Bootstrap heading <small>(18px)</small></h4>
  <h5>h5 Bootstrap heading <small>(14px)</small></h5>
  <h6>h6 Bootstrap heading <small>(12px)</small></h6>
</div>

</body>
</html>