Add nearly any HTML within, even for linked list groups like the one below.
<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
<!-- w w w . j a v a 2 s .com-->
<script src="http://java2s.com/style/jquery-1.8.0.min.js"></script>
<script src="http://java2s.com/style/bootstrap.min.js"></script>
</head>
<body style='margin: 20px;'>
<div class="list-group">
<a href="#" class="list-group-item active">
<h4 class="list-group-item-heading">List group item heading</h4>
<p class="list-group-item-text">Donec id elit non mi porta
gravida at eget metus. Maecenas sed diam eget risus varius blandit.</p>
</a> <a href="#" class="list-group-item">
<h4 class="list-group-item-heading">List group item heading</h4>
<p class="list-group-item-text">Donec id elit non mi porta
gravida at eget metus. Maecenas sed diam eget risus varius blandit.</p>
</a> <a href="#" class="list-group-item">
<h4 class="list-group-item-heading">List group item heading</h4>
<p class="list-group-item-text">Donec id elit non mi porta
gravida at eget metus. Maecenas sed diam eget risus varius blandit.</p>
</a>
</div>
</body>
</html>