如何显示这样一个边框:上边框 10 像素、下边框 5 像素、左边框 20 像素、右边框 1 像素? ( )
border-width:10px 5px 20px 1px
border-width:10px 20px 5px 1px
border-width:5px 20px 10px 1px
border-width:10px 1px 5px 20px
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