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diff --git a/dom/base/test/chrome/test_bug571390.xul b/dom/base/test/chrome/test_bug571390.xul
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+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=571390
+-->
+<window title="Mozilla Bug 571390"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+ class="foo bar">
+ <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=571390"
+ target="_blank">Mozilla Bug 571390</a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+
+ /** Test for Bug 571390 **/
+
+ is(document.documentElement.classList.length, 2, "Should have 2 classes.");
+ ok(document.documentElement.classList.contains("foo"), "Should contain 'foo' class.");
+ ok(document.documentElement.classList.contains("bar"), "Should contain 'bar' class.");
+ ok(!document.documentElement.classList.contains("foobar"), "Shouldn't contain 'foobar' class.");
+
+ document.documentElement.classList.add("foobar");
+ is(document.documentElement.classList.length, 3, "Should have 3 classes.");
+ ok(document.documentElement.classList.contains("foo"), "Should contain 'foo' class.");
+ ok(document.documentElement.classList.contains("bar"), "Should contain 'bar' class.");
+ ok(document.documentElement.classList.contains("foobar"), "Should contain 'foobar' class.");
+
+ document.documentElement.classList.remove("foobar");
+ is(document.documentElement.classList.length, 2, "Should have 2 classes.");
+ ok(document.documentElement.classList.contains("foo"), "Should contain 'foo' class.");
+ ok(document.documentElement.classList.contains("bar"), "Should contain 'bar' class.");
+ ok(!document.documentElement.classList.contains("foobar"), "Shouldn't contain 'foobar' class.");
+ ]]>
+ </script>
+</window>