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chromium/fuchsia_web/runners/cast/testdata/connector_multiple_ports.html 

<html>
  <head><title>so many ports wow</title></head>
  <body>
    <script>
      var port1 = cast.__platform__.PortConnector.bind('port1');
      var port2 = cast.__platform__.PortConnector.bind('port2');
      var port3 = cast.__platform__.PortConnector.bind('port3');

      function ackMsg(msg) {
        this.postMessage('ack ' + msg.data);
        return true;
      }

      port1.onmessage = ackMsg.bind(port1);
      port2.onmessage = ackMsg.bind(port2);
      port3.onmessage = ackMsg.bind(port3);
    </script>
  </body>
</html>