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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <video controls>
      <source src="https://cdn.theguardian.tv/webM/2015/07/20/150716YesMen_synd_768k_vp8.webm"
              type="video/webm">
      您的瀏覽器不支持Video標簽。
    </video>
</body>
</html>

The source code of the entire page is here. However, both PC and Android can be used. But iPhone cannot. I am puzzled