在工作中我们发现搜索框大部分都是有圆角的，为此作为经验不足的前端人员很容易就想到，给input标签添加border-radius属性不就解决了嘛。不错方法确实是这样，但是不要忘了border-radius是css3属性，IE8不兼容！！！那么问题来了，怎样在IE8下完美兼容呢？
网上有很多关于css3属性在IE8下兼容的方法，需要引入PIE.htc这个文件，相信很容易搜到并下载该文件，但是用上position:relative;behavoior:url(PIE.htc);后发现圆角是实现了，但会莫名的出现黑色边框就像图中这样
正常情况 IE8下有黑边
解决办法：
将input标签的border：none;外面的圆角边框用外层包裹的标签设置，为了不影响美观在配合margin或padding
最终的到的结果如下图所示，ff chome均达到完美兼容
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