css 动画之border-top-right-radius

编辑代码
<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
    width: 300px;
    height: 200px;
    border: 1px solid black;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {border-top-right-radius: 50px;}
}

/* Standard syntax */
@keyframes mymove {
    50% {border-top-right-radius: 50px;}
}
</style>
</head>
<body>

<p>逐步改变 border-top-right-radius 属性从 0 到 50px:<p>
<div id="myDIV"></div>

<p>border-top-right-radius 属性支持动画效果。</p>
<p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

</body>
</html>