请老师检查谢谢

来源：2-41 编程练习

慕UI4313976

2020-03-07 11:26:26

<!DOCTYPE html>
<html>
<head>
    <title></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: #f00;
        }
        section:empty{
            background: #abcedf;
        }
    </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>

写回答

1回答