<!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" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
<title>css hack</title>
<style type="text/css">
.demo{width:100px;height:100px;border:5px solid orange;}
.demo1{
background:black; /* for all */
}
.demo2{
background:green\9; /* for ie */
}
.demo3{
background:yellow\0; /* for ie8 */
}
.demo4{
*background:blue; /* for ie7,ie6 */
}
.demo5{
_background:red; /* for ie6 */
}
</style>
</head>
<body>
<div class="demo demo1"></div><br/>
<div class="demo demo2"></div><br/>
<div class="demo demo3"></div><br/>
<div class="demo demo4"></div><br/>
<div class="demo demo5"></div>
</body>
</html>