默认皮肤下边框透明写法不兼容IE10,我有个方法可以兼容

```
/*经测试兼容所有浏览器背景透明(不是opacity透明).*/
background-color:rgba(0,0,0,.7); /*标准浏览器*/
background-color:transparent\9\1; 
/*这种写法我无意发现的,它能清除IE9下background-color:rgba*/
filter:progid:DXImageTransform.Microsoft.Gradient(GradientType=1, 
startColorstr='#AF000000', endColorstr='#AF000000');    /*IE6789*/
```

Original issue reported on code.google.com by `xushengj...@gmail.com` on 3 Dec 2013 at 9:02
