1704660.html - mozsearch

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<html>

  <head>

    <script>

      function test() {

        var ifr = document.getElementsByTagName("iframe")[0];

        var form = ifr.contentDocument.getElementsByTagName("form")[0];

        form.onsubmit = function() {

          ifr.remove()

        form.lastChild.click();

    </script>

  </head>

  <body onload="test()">

    <iframe srcdoc="<form><input name=f type=file><button></button></form>"></iframe>

  </body>

</html>