<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
div:first-child {
width: 200px;
height: 200px;
background-color: pink;
box-sizing: content-box;
以前的标准盒模型 w3c
padding: 10px;
border: 15px solid red;
/* 盒子大小计算方式 width+padding+border */
}
div:last-child {
width: 200px;
height: 200px;
background-color: purple;
padding: 10px;
box-sizing: border-box
border: 15px solid red;
/* 盒子大小默认为width padding和 border 不影响盒子宽度 */
}
</style>
</head>
<body>
<div>content-box</div>
<div>border-box</div>
</body>
</html>
