css3 box-sizing详解。
人们慢慢的意识到传统的盒子模型不直接,所以他们新增了一个叫做 box-sizing 的CSS属性。
box-sizing: 盒大小,盒模型.
我们经常遇到左右模块宽度为50%,加个边框会掉下去,加一个这个样式就能解决,看下栗子:
<!DOCTYPE html>
<html>
<head>
<style>
div.container
{
width:300px;
border:10px solid blue;
}
div.box
{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
-webkit-box-sizing:border-box; /* Safari */
width:50%;
height:80px;
padding:10px;
border:10px solid red;
float:left;
}
</style>
</head>
<body> <div class="container">
<div class="box">这个 div 占据左半部分。</div>
<div class="box">这个 div 占据右半部分。</div>
<div style="clear:both;"></div>
</div> </body>
</html>
aaarticlea/png;base64,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" alt="" />
box-sizing属性可以为三个值之一:content-box(default),border-box,padding-box。
content-box,border和padding不计算入width之内
padding-box,padding计算入width内
border-box,border和padding计算入width之内,其实就是怪异模式了。
梨子:
<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>
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