css实现0.5像素的边框的示例代码

<div class="border3">

    <div class="content">伪类设置的边框</div>

</div>  

.border3{

     position: relative;          

 }

 

.border3:before{

       content: '';

       position: absolute;

       width: 200%;

       height: 200%;

       border: 1px solid red;

       -webkit-transform-origin: 0 0;

       -moz-transform-origin: 0 0;

       -ms-transform-origin: 0 0;

       -o-transform-origin: 0 0;

       transform-origin: 0 0;

       -webkit-transform: scale(0.5, 0.5);

       -ms-transform: scale(0.5, 0.5);

       -o-transform: scale(0.5, 0.5);

       transform: scale(0.5, 0.5);

       -webkit-box-sizing: border-box;

       -moz-box-sizing: border-box;

       box-sizing: border-box;

}