​x
 
<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript" src="/jquery/jquery.js"></script>
</head>
​
<body>
<ul>
  <li>list <strong>item 1</strong></li>
  <li><span>list item 2</span></li>
  <li>list item 3</li>
</ul>
​
<script>
$("ul").click(function(event) {
  var $target = $(event.target);
  if ( $target.is("li") ) {
    $target.css("background-color", "red");
  }
});
</script>
​
</body>
</html>
​