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+++ b/image/test/mochitest/test_changeOfSource.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=666446
+-->
+<head>
+  <title>Test for Bug 666446 - Change of Source (1st Version)</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+  <script type="application/javascript" src="imgutils.js"></script>
+  <script type="application/javascript" src="animationPolling.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=666446">
+Mozilla Bug 666446: lots of animated gifs swamp us with paint events
+</a>
+<p id="display"></p>
+
+<div id="content">
+  <div id="referenceDiv" style="height: 40px; width: 40px;
+                                display: none; background: #2aff00;">
+  </div>
+  <div id="animatedImage">
+    <img id='animatedGif' src="animated-gif.gif" style="display: none;">
+  </div>
+  <div id="text-descr"></div>
+  <div id="debug" style="display:none">
+  </div>
+</div>
+<pre id="test">
+<script type="text/javascript">
+const FAILURE_TIMEOUT = 120000; // Fail early after 120 seconds (2 minutes)
+
+var gAnimTest;
+var gIntervalId;
+
+function initSecondTest() {
+  document.getElementById('debug').style.display = 'none';
+  document.getElementById('referenceDiv').style.background = "#9600ff";
+  document.getElementById('animatedGif').setAttribute('src',
+                                                      'animated-gif2.gif');
+  document.getElementById('animatedGif').style.display = 'none';
+  var secondTest = new AnimationTest(20, FAILURE_TIMEOUT, 'referenceDiv',
+                                     'animatedGif', 'debug', '', '', false);
+  secondTest.beginTest();
+}
+
+function main()
+{
+  gAnimTest = new AnimationTest(20, FAILURE_TIMEOUT, 'referenceDiv',
+                                'animatedGif', 'debug', '', '', false,
+                                initSecondTest);
+  gAnimTest.beginTest();
+
+}
+
+window.onload = main;
+</script>
+</pre>
+</body>
+</html>