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Test Info:

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Page Visibility Null Default View Test</title>
<link rel="author" title="Microsoft" href="" />
<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()
// inject a windowless subdocument as a child of the root document <html> element
var subDoc = document.implementation.createDocument('resources/blank_page_green.html', 'html', null);
// Test precondition: ensure subdocument has a null default view
test_true(subDoc.defaultView == null, "windowless subdocument generated for test has a null default view");
// check that feature exists within subdocument
test_feature_exists(subDoc, 'windowless subdocument');
// check that the subdocument has a hidden visibility state
"hidden == true for windowless subdocuments with a null default view");
test_equals(subDoc.visibilityState, VISIBILITY_STATES.HIDDEN,
"visibilityState == " + VISIBILITY_STATES.HIDDEN +
" for windowless subdocuments with a null default view");
<body onload="onload_test()">
<p>This test validates that document.hidden == false and
document.visibilityState == "visible" for windowless subdocuments.</p>
<div id="log"></div>