​x
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<style type="text/css">
[title~=hello]
{
color:red;
} 
</style>
</head>
​
<body>
<h1>可以应用样式：</h1>
<h2 title="hello world">Hello world</h2>
<p title="student hello">Hello W3School students!</h1>
<hr />
​
<h1>无法应用样式：</h1>
<h2 title="world">Hello world</h2>
<p title="student">Hello W3School students!</p>
</body>
</html>
​