ownerdiscard.html - mozsearch

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<!DOCTYPE html>

<html class="reftest-wait">

<body>

  <div id=tCF0>

    <img id=victim src=ie.png>

    <iframe src=discardframe.htm></iframe>

  </div>

  <script>

    const Ci = SpecialPowers.Ci;

    const Cc = SpecialPowers.Cc;

    function ImageDecoderObserverStub()

      this.sizeAvailable = function sizeAvailable(aRequest)   {}

      this.frameComplete = function frameComplete(aRequest)   {}

      this.decodeComplete = function decodeComplete(aRequest) {}

      this.loadComplete = function loadComplete(aRequest)     {}

      this.frameUpdate = function frameUpdate(aRequest)       {}

      this.discard = function discard(aRequest)               {}

      this.isAnimated = function isAnimated(aRequest)         {}

    var img = document.getElementById('victim');

    var observer = new ImageDecoderObserverStub();

    observer.discard = function() {

      cleanupAndFinish();

    observer = SpecialPowers.wrapCallbackObject(observer);

    var gObserver = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools)

                                                    .createScriptedObserver(observer);

    var imgLoadingContent = SpecialPowers.wrap(img);

    imgLoadingContent.addObserver(gObserver);

    function initCF() {

      setTimeout(function() { document.adoptNode(tCF0); }, 0);

    document.addEventListener("DOMContentLoaded", initCF);

    function cleanupAndFinish() {

      imgLoadingContent.removeObserver(gObserver);

      setTimeout("document.documentElement.className = '';", 0);

    function loadhandler() {

      setTimeout("cleanupAndFinish();", 30000);

    window.addEventListener("load", function() {

      SpecialPowers.pushPrefEnv({"set":[["min_discard_timeout_ms", 1]]}, loadhandler)});

  </script>

</body>

</html>