lovecoding
/
VIP22


			
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

        #div0{
            background: #ccc;
            /* height: 200px; */
            /* overflow: hidden; */
        }
        #div1{
            width: 200px;
            height: 200px;
            background: #f00;

            float: left;
        }
        #div2{
            width: 200px;
            height: 200px;
            background: #0f0;

            float: left;
        }
        h1{
            height: 100px;
            background: pink;
        }

        /* clearfix元素的内部、后边添加一个伪元素  */
        .clearfix::after{
            content:'';
            display: block;
            clear: both;
        }

    </style>
</head>
<body>

    <div id="div0" class="clearfix">
        <div id="div1"></div>
        <div id="div2"></div>
        <!-- 浮动的元素下边 块元素 -->
        <!-- <div style="clear:both"></div> -->
        <!-- ::after -->
    </div>

    <h1></h1>

    <!-- div1和div2 浮动， 浮动的元素会脱离文档流 空间释放
    
        导致div0没有内容撑着--没有高度
        
        解决方式    
            1 给父元素添加一个高度
            2 给父元素添加一个overflow:hidden;
            3 clear:both
            4 clearfix

    
    -->


</body>
</html>