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<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
  <meta charset="utf-8">
  <script type="text/javascript">

  var shared;

  function init() {
   shared = new SharedWorker("shared_worker.js");
   shared.port.start();
   for (let i = 0; i < 10; i++) shared.port.postMessage(["ok"]);
  }

  </script>
</head>
<body onload="init()">
  <h1>A page with a shared worker</h1>
</body>
</html>