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来源：2-14 编程练习

慕UI4313976

2020-02-02 11:51:32

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .per{
            width: 300px;
            height: auto;
            border:2px solid #aaa;
            /* overflow: hidden; */
        }
        .li{
            width: 100px;
            height: 100px;
            background: red;
            margin: 5px;
            float: left;
        }

        /*此处写代码*/
        /* .clear{
            clear:both;
        } */
        .per:after{
            content:".";
            height:0px;
            display:block;
            visibility:hidden;
            clear:both;
        }
        .per{zoom: 1;}
    </style>
</head>
<body>
    <div class="per">
        <div class="li"></div>
        <div class="li"></div>
        <!-- 此处写代码 -->
        <!-- <div class="clear"></div> -->
    </div>
</body>
</html>

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