兼容性— IE6下子元素宽高会撑大父级

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .box{
            width: 200px;
            height: 200px;
            border:10px solid black;
        }
        .content{
            width: 400px;
            height: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="content"></div>
    </div>
</body>
</html>

IE6下效果

兼容性— IE6下子元素宽高会撑大父级

其他浏览器下效果

兼容性— IE6下子元素宽高会撑大父级

解决方案：编写代码时，尽量使子级元素宽高小于父级

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