CSS3 box-sizing使用实例页面

CSS代码：

.box_sizing{
    width:180px; 
    padding:40px 20px; 
    background:#a0b3d6;
    overflow:hidden;
}
.box_sizing .in{
    width:100%;
    border:12px double #34538b;
    background:white;
    padding:5px;
    box-sizing:border-box;
    -o-box-sizing:border-box;
    -ms-box-sizing:border-box;
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
}
                

HTML代码：

<div class="box_sizing">
    <div class="in">此处12像素的border和5像素的padding值算在宽度里面了~~</div>
</div>