content/base/test/chrome/test_bug571390.xul

<?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>