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+<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset="utf-8" />
+ <title>Page Visibility API is Read Only</title>
+
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
+ <script type="text/javascript" src="resources/pagevistestharness.js"></script>
+
+ <script type="text/javascript">
+ setup({ explicit_done: true });
+ function onload_test()
+ {
+ //check for feature definition first before attempting to overwrite
+ pv_test();
+
+ //Check document.hidden
+ document.hidden = "new value";
+ test_true(document.hidden !== "new value", 'document.hidden is read only.');
+
+ //Check document.visibilityState
+ document.visibilityState = "new value";
+ test_true(document.visibilityState !== "new value",
+ "document.visibilityState is read only.");
+
+ done();
+ }
+ </script>
+ </head>
+ <body onload="onload_test();">
+ <h1>Description</h1>
+ <p>This test validates that the Page Visibility attributes are read only.</p>
+
+ <div id="log"></div>
+ </body>
+</html>