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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=573255
+-->
+<head>
+ <title>Test for Bug 573255</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <style type="text/css">
+
+ #display:not(.hasSummary) { visibility: hidden }
+
+ </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=573255">Mozilla Bug 573255</a>
+<p id="display"></p>
+<pre id="test">
+<script type="application/javascript">
+
+var p = document.getElementById("display");
+var cs = getComputedStyle(p, "");
+
+is(cs.visibility, "hidden", "should be visibility:none since it has no class");
+p.className = "hasSummary";
+is(cs.visibility, "visible", "changing class attribute should remove visibility:hidden");
+
+</script>
+</pre>
+</body>
+</html>