<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 100px;
height: 100px;
background-color: red;
animation-name: example;
animation-duration: 4s;
}
@keyframes example {
from {
background-color: red;
}
to {
background-color: yellow;
}
}
</style>
</head>
<body>
<p><b>注释：</b>本例在 Internet Explorer 9 以及更早的版本中无效。</p>
<div></div>
<p><b>注释：</b>当动画结束后，会变回最初的样式。</p>
</body>
</html>
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