box-sizing屬性能夠爲三個值之一:content-box(default),border-box,padding-box。css
content-box,border和padding不計算入width以內android
padding-box,padding計算入width內ios
border-box,border和padding計算入width以內,其實就是怪異模式了~web
ie8+瀏覽器支持content-box和border-box;瀏覽器
ff則支持所有三個值。spa
使用時:code
-webkit-box-sizing: 100px; // for ios-safari, androidblog
-moz-box-sizing:100px; //for ffit
box-sizing:100px; //for otherio
栗子:
<style type="text/css">
.content-box{
box-sizing:content-box;
-moz-box-sizing:content-box;
width: 100px;
height: 100px;
padding: 20px;
border: 5px solid #E6A43F;
background: blue;
}
.padding-box{
box-sizing:padding-box;
-moz-box-sizing:padding-box;
width: 100px;
height: 100px;
padding: 20px;
border: 5px solid #186645;
background: red;
}
.border-box{
box-sizing:border-box;
-moz-box-sizing:border-box;
width: 100px;
height: 100px;
padding: 20px;
border: 5px solid #3DA3EF;
background: yellow;
}
</style>
截圖(ff):