dom/workers/test/serviceworkers/simpleregister/ready.html


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<html>
  <head></head>
  <body>
    <script type="text/javascript">

      window.addEventListener('message', function(evt) {
        navigator.serviceWorker.ready.then(function() {
          evt.ports[0].postMessage("WOW!");
        });
      }, false);

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