要定义三次贝塞尔曲线，请使用三次bezier()函数。您可以尝试运行以下代码来实现bicube-bezier()函数
<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 100px;
height: 100px;
background: yellow;
transition: width 3s;
transition-timing-function: cubic-bezier(0.3, 0.3, 2.0, 0.9);
}
div:hover {
width:200px;
}
</style>
</head>
<body>
<p>Hover over the below container:</p>
<div></div>
</body>
</html>