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DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>Page Visibility Null Default View Test</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />

        <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
                test_true(subDoc.hidden,
                          "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");

                done();
            }
        </script>
    </head>
    <body onload="onload_test()">
        <h1>Description</h1>
        <p>This test validates that document.hidden == false and
           document.visibilityState == "visible" for windowless subdocuments.</p>
        <div id="log"></div>
    </body>
</html>