File: iframe_messageChannel_post.html

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<!DOCTYPE HTML>
<html>
<body>
  <script type="application/javascript">

  var port;

  window.addEventListener('message', receiveMessage);
  function receiveMessage(evt) {
    port = evt.data.port;

    port.addEventListener('message', receivePostMessage);
    function receivePostMessage(event) {
      port.postMessage(event.data);
    }
    port.start();

    window.parent.postMessage({ status: "READY" }, '*');
  }

  </script>
</body>
</html>