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diff --git a/dom/html/test/test_bug593689.html b/dom/html/test/test_bug593689.html
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+++ b/dom/html/test/test_bug593689.html
@@ -0,0 +1,50 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=593689
+-->
+<head>
+  <title>Test for Bug 593689</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=593689">Mozilla Bug 593689</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 593689 **/
+function testWidth(w) {
+  var img = new Image(w);
+  is(img.width, w|0, "Unexpected handling of '" + w + "' width");
+}
+
+testWidth(1);
+testWidth(0);
+testWidth("xxx");
+testWidth(null);
+testWidth(undefined);
+testWidth({});
+testWidth({ valueOf() { return 10; } });
+
+function testHeight(h) {
+  var img = new Image(100, h);
+  is(img.height, h|0, "Unexpected handling of '" + h + "' height");
+}
+
+testHeight(1);
+testHeight(0);
+testHeight("xxx");
+testHeight(null);
+testHeight(undefined);
+testHeight({});
+testHeight({ valueOf() { return 10; } });
+
+</script>
+</pre>
+</body>
+</html>