请问这样写会有什么缺陷吗

来源：2-21 自由编程

扶耳摩兔

2021-01-16 16:49:08

没有按题目步骤来但效果基本实现了

<!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>
        *{
            margin: 0;
            padding:0;
        }
        div{
            height: 81px;
            width: 88px;
            background-image: url(images/xin.png);
            margin: 40px auto;
        }
        div::after{
            content: '';
            display: block;
            height: 81px;
            width: 88px;
            background-image: url(images/xin.png);
            animation: td .5s linear 0s infinite ;
        }
        @keyframes td{
            from{
                transform: scale(1);
                opacity: 1;
            }
            to{
                transform: scale(2);
                opacity: 0;
            }
        }
    </style>
</head>

<body>
    <div></div>

</body>
</html>