html运行实例（responsive_video

代码示例：（标识：responsive_video_1）

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
video {
  width: 100%;
  height: auto;
}
</style>
</head>
<body>

<video width="400" controls>
  <source src="/static/demo/video/shanghai.mp4" type="video/mp4">
  Your browser does not support HTML5 video.
</video>

<p>请调整浏览器窗口的大小，来查看视频播放器如何缩放。</p>

</body>
</html>