diff --git a/content/xml/document/test/Makefile.in b/content/xml/document/test/Makefile.in
index 86b26866218c..34e83f20dc22 100644
--- a/content/xml/document/test/Makefile.in
+++ b/content/xml/document/test/Makefile.in
@@ -47,6 +47,7 @@ include $(topsrcdir)/config/rules.mk
 _TEST_FILES = 	test_bug232004.xhtml \
 		test_bug343870.xhtml \
 		test_bug355213.xhtml \
+		test_bug399502.xhtml \
 		$(NULL)
 
 libs:: $(_TEST_FILES)
diff --git a/content/xml/document/test/test_bug399502.xhtml b/content/xml/document/test/test_bug399502.xhtml
new file mode 100644
index 000000000000..5b88b76b2224
--- /dev/null
+++ b/content/xml/document/test/test_bug399502.xhtml
@@ -0,0 +1,42 @@
+<?xml version="1.0"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=399502
+-->
+<head>
+  <title>Test for Bug 399502</title>
+  <script type="text/javascript" src="/MochiKit/packed.js"></script>
+  <script type="text/javascript" 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=399502">Mozilla Bug 399502</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+/** Test for Bug 399502 **/
+
+var xmldoc;
+function runTest() {
+  xmldoc = document.implementation.createDocument("", "", null);
+  xmldoc.onload = function(evt) {
+                    ok(true, "Onload handler didn't get called!");
+                    SimpleTest.finish();
+                  };
+  xmldoc.load("test_bug399502.xhtml");
+}
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+
+]]>
+</script>
+</pre>
+</body>
+</html>
+
