<!DOCTYPE html>
<html>
<head>
<style>
.full { border: 1px solid red; }
</style>
<script type="text/javascript" src="/js/jquery.js"></script>
</head>
<body>
<ul>
<li>list item 1</li>
<li>list item 2
<li>list item 2-a</li>
<li>list item 2-b</li>
</ul>
</li>
<li>list item 3</li>
<li>list item 4</li>
<script>
$('li').has('ul').css('background-color', 'red');
</script>
</body>
</html>