<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box {
/* infinite 无限循环
alternate 逆播 */
animation: changes 3s infinite alternate;
}
/* 百分比是相对动画时长 */
@keyframes changes {
0% {
width: 100px;
height: 100px;
background-color: red;
}
30% {
width: 200px;
height: 400px;
background-color: blue;
}
60% {
width: 300px;
height: 600px;
background-color: skyblue;
}
100% {
width: 600px;
height: 800px;
background-color: #ccc;
}
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
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