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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=466586
+-->
+<head>
+  <title>Test for Bug 466586</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+
+<body onload="loadSmall();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=89419">Mozilla Bug 466586</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <img id="big" src="big.png"/>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+var jsBig = new Image();
+
+// We have loaded the large png with id "big". We want to test if it will be
+// kicked out of the cache and thus have to be reloaded, but to ensure that, we
+// need to get the cache to look at what is there. So we load another image,
+// this one small.
+function loadSmall()
+{
+  // Trivial check, for reference.
+  is(document.getElementById("big").width, 3000,
+     "HTML 'big' image width after page onload()");
+
+  var small = new Image();
+  small.onload = smallLoaded;
+  small.src = "red.png";
+}
+
+function smallLoaded()
+{
+  jsBig.src = document.getElementById("big").src;
+  // Check that it is not needed to wait for onload().
+  is(jsBig.width, 3000, "JS 'big' image width before its onload()");
+  // Check again after onload(), for reference.
+  jsBig.onload = jsBigLoaded;
+}
+
+function jsBigLoaded()
+{
+  is(jsBig.width, 3000, "JS 'big' image width after its onload()");
+
+  SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>