docshell/test/browser/onpageshow_message.html


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<html>
  <head>
    <meta charset="utf-8">
    <script>
      addEventListener("pageshow", function() {
        opener.postMessage("pageshow", "*");
      });
    </script>
  </head>
  <body>
    This file posts a message containing "pageshow" to opener on pageshow.
  </body>
</html>