dom/base/test/file_bug590870.html

   1 <html>
   2   <head>
   3     <script>
   4 onload = function() {
   5   var x = null;
   6   try {
   7     x = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "spacer");
   8   } catch(ex) {}
   9   window.parent.postMessage(x == null, "http://mochi.test:8888");
  10 }
  11     </script>
  12   </head>
  13   <body>
  14     Here be dragons!
  15   </body>
  16 </html>