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chromium
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chromium/chrome/test/data/web_share_target/multimedia.html 

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <link rel="manifest" href="multimedia.json">
  <link rel="icon" href="basic-48.png">
</head>
<body>
  <h1>Multimedia web app</h1>
  <script>
    window.onload = () => {
      navigator.serviceWorker.register('/web_share_target/service_worker.js');
    };
  </script>
</body>
</html>