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关于width的继承和获取

absolute元素（如果没有设置width值），其宽度自适应于内部元素，

<!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>
        body,
        html {
            margin: 0;
            padding: 0
        }
        
        .div1 {
            width: 100%;
            height: 300px;
            background: red
        }
        
        .div2 {
            background: blue;
            height: 200px;
            position: absolute;
        }
        
        .div3 {
            width: 100px;
            background: yellow;
            height: 50px;
        }
    </style>
</head>

<body>
    <div class="div1">
        <div class="div2">
            <div class="div3"></div>
        </div>
    </div>
</body>

</html>

<!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>
        body,
        html {
            margin: 0;
            padding: 0
        }
        
        .div1 {
            /*  100%; */
            height: 300px;
            background: red
        }
        
        .div2 {
            background: blue;
            height: 200px
        }
        
        .div3 {
            width: 100px;
            background: yellow;
            height: 50px;
        }
    </style>
</head>

<body>
    <div class="div1">
        <div class="div2">
            <div class="div3"></div>
        </div>
    </div>
</body>

</html>

如果最外层div 不给宽度，内层div不设置宽度，则宽度均为100%；

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原文地址：https://www.cnblogs.com/moxiaowohuwei/p/7506259.html