::before,::after

效果图：
代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
a {  
    position: relative;  
    display: inline-block;  
    outline: none;  
    text-decoration: none;  
    color: #000;  
    font-size: 32px;  
    padding: 5px 10px;  
}  
  
a:hover::before, a:hover::after { position: absolute; }  
a:hover::before { content: "5B"; left: -10px; }  
a:hover::after { content: "5D"; right:  -10px; }  
</style>
</head>

<body>
<a>family</a>
</body>
</html>