请老师检查3-31作业谢谢

来源：3-31 编程练习

清夏_

2022-04-04 15:52:00

<!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 type="text/css">
        div {
            width: 200px;
            height: 150px;
            background-color: #eee;
            margin-top: 5px;
        }

        section {
            width: 200px;
            height: 30px;
            margin-bottom: 5px;
            background-color: #ff0;
        }

        /*此处写代码*/
        div:empty {
            background-color: #f00;
        }

        section:empty {
            background-color: #abcdef;
        }
    </style>
</head>

<body>
    <div>
        <section>one</section>
        <section>two</section>
    </div>
    <div></div>
    <div>
        <section>three</section>
        <section>four</section>
        <section>five</section>
        <section></section>
    </div>
</body>

</html>

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