http://www.iefans.net/wp-demo/ms-clear.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title> ::-ms-clear、::-ms-reveal 属性演示</title>
<style type='text/css'>
input { display: block; margin: 5px }
.t::-ms-clear { display: none; }
::-ms-reveal { display: none; }
</style>
</head>
<body>
<input type="text" />
<input type="text" class="t" />
<input type="password" class="pwd" />
<input type="button" value="OK" />
</body>
</html>