<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Page Visibility API Definition</title>
<script type="text/javascript" src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type="text/javascript" src="resources/pagevistestharness.js"></script>
</head>
<body>
<h1>Description</h1>
<p>This test validates that all of the attributes associated with the Page Visibility feature exist
(but does not validate that their values are correct).</p>
<div id="log"></div>
<script type="text/javascript" >
test_feature_exists();
</script>
</body>
</html>