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    <head>
        <meta charset="utf-8">
        <title>Navigation Timing 2 WPT</title>
        <link rel="author" title="Google" href="http://www.google.com/" />
        <link rel="help" href="http://www.w3.org/TR/navigation-timing-2/#sec-PerformanceNavigationTiming"/>
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
        <script src="/common/get-host-info.sub.js"></script>
    </head>
    <body>
        <h1>Description</h1>
        <p>This test validates that the values of nav timing 2 instance's timing-related attributes are in certain order and the others are of expected values.</p>

        <script>
        // Host names and ports may be configured at test execution time. The
        // web-platform-tests server offers two mechanisms for retrieving these
        // values dynamically: direct text substitution and the `get-host-info`
        // script. The former is inapproprate for this test because it
        // influences the size of the document, and this test includes static
        // assertions for that value.
        var host_info = get_host_info();
        var expectedUrl = "http://" + host_info.ORIGINAL_HOST + ":" +
            host_info.HTTP_PORT +
            "/navigation-timing/nav2_test_attributes_values.html";
        var navTiming2EventOrder1 = [
            'startTime',
            'redirectStart',
            //'unloadEventStart',
            'redirectEnd',
            //'unloadEventEnd',
            'fetchStart',
            'domainLookupStart',
            'domainLookupEnd',
            'connectStart',
            //'secureConnectionStart',
            'connectEnd',
            'requestStart',
            'responseStart',
            'responseEnd',
            'domInteractive',
            'domContentLoadedEventStart',
            'domContentLoadedEventEnd',
            'domComplete',
            'loadEventStart',
            'loadEventEnd'
        ];

        var navTiming2EventOrder2 = [
            'redirectStart',
            'unloadEventStart',
            'redirectEnd',
            'unloadEventEnd',
            'fetchStart'
        ];

        var navTiming2EventOrder3 = [
            'connectStart',
            'secureConnectionStart',
            'connectEnd'
        ];

        // Navigation Timing attributes for comparison.
        var navTiming1EventOrder = [
            'fetchStart',
            'domainLookupStart',
            'domainLookupEnd',
            'connectStart',
            'connectEnd',
            'requestStart',
            'responseStart',
            'responseEnd',
            'domInteractive',
            'domContentLoadedEventStart',
            'domContentLoadedEventEnd',
            'domComplete',
            'loadEventStart',
            'loadEventEnd'
        ];

        function verifyTimingEventOrder(eventOrder, timingEntry) {
            for (var i = 0; i < eventOrder.length - 1; i++) {
                assert_true(timingEntry[eventOrder[i]] <= timingEntry[eventOrder[i + 1]],
                    "Expected " + eventOrder[i] + " to be no greater than " + eventOrder[i + 1] + ".");
            }
        }

        async_test(function (t) {
            var observer = new PerformanceObserver(
                t.step_func(function (entryList) {
                    var entries = entryList.getEntries();
                    assert_equals(entries[0].entryType, "navigation",
                        "Expected entryType to be: navigation.");
                    assert_equals(entries[0].name, expectedUrl);
                    assert_equals(entries[0].startTime, 0,
                        "Expected startTime to be: 0.");
                    assert_equals(entries[0].duration, entries[0].loadEventEnd,
                        "Expected duration to be equal to loadEventEnd.");
                    assert_equals(entries[0].initiatorType, "navigation",
                        "Expected initiatorType to be: navigation.");
                    assert_equals(entries[0].nextHopProtocol, "http/1.1");
                    // This test may fail when response is from cach. Disable or clean cach before
                    // running this test.
                    assert_true(entries[0].transferSize > entries[0].encodedBodySize,
                        "Expected transferSize to be greater than encodedBodySize in uncached navigation.");
                    assert_equals(entries[0].encodedBodySize, 5955);
                    assert_equals(entries[0].decodedBodySize, 5955);
                    verifyTimingEventOrder(entries[0], navTiming2EventOrder1);
                    // Verify if the reported timing is not that different
                    // from what is reported by Navigation Timing 1.
                    navTiming1EventOrder.forEach(
                      function(event) {
                        if (window.performance.timing[event] -
                            window.performance.timing.navigationStart > 0) {
                          assert_greater_than(entries[0][event], 0,
                              "Expected " + event + " to be greater than 0");
                        }
                    });
                    // When unloadEvent happens
                    if (entries[0]["unloadEventStart"] != 0) {
                        verifyTimingEventOrder(entries[0], navTiming2EventOrder2);
                    }
                    // When a secure transport is used
                    if (entries[0]["secureConnectionStart"] != 0) {
                        verifyTimingEventOrder(entries[0], navTiming2EventOrder3);
                    }
                    observer.disconnect();
                    t.done();
                })
            );
            observer.observe({entryTypes: ["navigation"]});

        }, "Performance navigation timing instance's value is reasonable.");
        </script>
    </body>
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