<!DOCTYPE html>
<html lang="zh-CN">
<head>
</head>
<body>
<h1>你好，世界！</h1>
<div>我是你的啥</div>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 100 100"
width="750px" height="100"
style="background:red">
<animate attributeName="height"
begin="0s" dur="0.5s"
restart="whenNotActive" value="10;100;10;200"
repeatCount="indefinite"
calcMode="discreate"></animate>
</svg>
</body>
</html>