Meta标签的妙用

<meta name ="keywords" content="">    
<meta name="description" content="">    
<meta name="author" content="">    
<meta http-equiv="Refresh" content="2;URL=http://www.xxx.com">    
<meta http-equiv="Window-target" content="_top">    
<meta http-equiv="content-Type" content="text/html; charset=gb2312">     
<meta http-equiv="Content-Language" content="zh-cn" />    
<meta http-equiv="Page-Enter" content="revealTrans(duration=5.0,transition=20）">    
<meta http-equiv="Page-Exit" content="revealTrans(duration=5.0,transition=20）">

Duration表示滤镜特效的持续时间（单位：秒）Transition滤镜类型。表示使用哪种特效，取值为0-23;