HTML+CSS解决高度塌陷和垂直重叠

问题

解决高度坍塌

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1 {
            border: 10px solid red;
            overflow: hidden;
            /* 解决ie6高度塌陷问题 */
            zoom: 1; 
        }
        .box2 {
            background-color: blueviolet;
            width: 100px;
            height: 100px;
            float: left;
        }
    </style>
</head>


<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>

</html>

解决高度坍塌和内容重叠

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1 {
            border: 10px solid red;
        }

        /* 高度坍塌和垂直重叠 */
        .clearfix:after,
        .clearfix:before {
            /* 添加内容 */
            content: '';
            /* 转换块状元素 */
            display: table;
            /* 清除浮动 */
            clear: both;
        }

        .box2 {
            background-color: blueviolet;
            width: 100px;
            height: 100px;
            float: left;
        }

        .box3 {
            background-color:blue;
            width: 200px;
            height: 200px;
            margin-top: 100px;
        }

        .box4 {
            background-color:yellow;
            width: 100px;
            height: 100px;
           margin-top: 50px;
        }
    </style>
</head>


<body>
    <div class="box1 clearfix">
        <div class="box2"></div>
    </div>

    <div class="box3 clearfix">
        <div class="box4"></div>
    </div>
</body>

</html>

解决后

推荐第二种方法，副作用较小。