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    <head>
        <meta charset="UTF-8" />
        <title>window.performance User Timing clearMeasures() method is working properly with navigation timing
               attributes</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="http://www.w3.org/TR/user-timing/#dom-performance-measure"/>
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
        <script src="resources/webperftestharness.js"></script>

    <script type="text/javascript">
        // test data
        var startMarkName = "mark_start";
        var startMarkValue;
        var endMarkName = "mark_end";
        var endMarkValue;
        var measures;
        var testThreshold = 20;

        // test measures
        measureTestDelay = 200;
        var TEST_MEASURES =
        [
            {
                name:                   "measure_nav_start_no_end",
                startMark:              "navigationStart",
                endMark:                undefined,
                exceptionTestMessage:   "window.performance.measure(\"measure_nav_start_no_end\", " +
                                        "\"navigationStart\") ran without throwing any exceptions.",
                expectedStartTime:      undefined,
                expectedDuration:       undefined,
                entryMatch:             undefined
            },
            {
                name:                   "measure_nav_start_mark_end",
                startMark:              "navigationStart",
                endMark:                "mark_end",
                exceptionTestMessage:   "window.performance.measure(\"measure_nav_start_end\", \"navigationStart\", " +
                                        "\"mark_end\") ran without throwing any exceptions.",
                expectedStartTime:      undefined,
                expectedDuration:       undefined,
                entryMatch:             undefined
            },
            {
                name:                   "measure_mark_start_nav_end",
                startMark:              "mark_start",
                endMark:                "responseEnd",
                exceptionTestMessage:   "window.performance.measure(\"measure_start_nav_end\", \"mark_start\", " +
                                        "\"responseEnd\") ran without throwing any exceptions.",
                expectedStartTime:      undefined,
                expectedDuration:       undefined,
                entryMatch:             undefined
            },
            {
                name:                   "measure_nav_start_nav_end",
                startMark:              "navigationStart",
                endMark:                "responseEnd",
                exceptionTestMessage:   "window.performance.measure(\"measure_nav_start_nav_end\", " +
                                        "\"navigationStart\", \"responseEnd\") ran without throwing any exceptions.",
                expectedStartTime:      undefined,
                expectedDuration:       undefined,
                entryMatch:             undefined
            }
        ];

        setup({explicit_done: true});

        test_namespace();

        function onload_test()
        {
            // test for existance of User Timing and Performance Timeline interface
            if (!has_required_interfaces())
            {
                test_true(false,
                          "The User Timing and Performance Timeline interfaces, which are required for this test, " +
                          "are defined.");

                done();
            }
            else
            {
                // create the start mark for the test measures
                window.performance.mark(startMarkName);

                // get the start mark's value
                startMarkValue = window.performance.getEntriesByName(startMarkName)[0].startTime;

                // create the test end mark using the test delay; this will allow for a significant difference between
                // the mark values that should be represented in the duration of measures using these marks
                setTimeout(measure_test_cb, measureTestDelay);
            }
        }

        function measure_test_cb()
        {
            // create the end mark for the test measures
            window.performance.mark(endMarkName);

            // get the end mark's value
            endMarkValue = window.performance.getEntriesByName(endMarkName)[0].startTime;

            // loop through measure scenarios
            for (var i in TEST_MEASURES)
            {
                var scenario = TEST_MEASURES[i];

                if (scenario.startMark != undefined && scenario.endMark == undefined)
                {
                    // only startMark is defined, provide startMark and don't provide endMark
                    window.performance.measure(scenario.name, scenario.startMark);

                    // when startMark is provided to the measure() call, the value of the mark or navigation
                    // timing attribute whose name is provided is used for the startMark
                    scenario.expectedStartTime = (timingAttributes.indexOf(scenario.startMark) != -1 ?
                                                  window.performance.timing[scenario.startMark] -
                                                  window.performance.timing.navigationStart :
                                                  startMarkValue);

                    // when endMark isn't provided to the measure() call, a DOMHighResTimeStamp corresponding to
                    // the current time with a timebase of the navigationStart attribute is used
                    scenario.expectedDuration = ((new Date()) - window.performance.timing.navigationStart) -
                                                scenario.expectedStartTime;
                }
                else if (scenario.startMark != undefined && scenario.endMark != undefined)
                {
                    // both startMark and endMark are defined, provide both parameters
                    window.performance.measure(scenario.name, scenario.startMark, scenario.endMark);

                    // when startMark is provided to the measure() call, the value of the mark or navigation
                    // timing attribute whose name is provided is used for the startMark
                    scenario.expectedStartTime = (timingAttributes.indexOf(scenario.startMark) != -1 ?
                                                  window.performance.timing[scenario.startMark] -
                                                  window.performance.timing.navigationStart :
                                                  startMarkValue);

                    // when endMark is provided to the measure() call, the value of the mark whose name is
                    // provided is used for the startMark
                    scenario.expectedDuration = (timingAttributes.indexOf(scenario.endMark) != -1 ?
                                                 window.performance.timing[scenario.endMark] -
                                                 window.performance.timing.navigationStart :
                                                 endMarkValue) - scenario.expectedStartTime;
                }
            }

            // test the test measures are returned by getEntriesByName
            for (var i in TEST_MEASURES)
            {
                entries = window.performance.getEntriesByName(TEST_MEASURES[i].name);
                test_measure(entries[0],
                            "window.performance.getEntriesByName(\"" + TEST_MEASURES[i].name + "\")[0]",
                            TEST_MEASURES[i].name,
                            TEST_MEASURES[i].expectedStartTime,
                            TEST_MEASURES[i].expectedDuration);
                TEST_MEASURES[i].entryMatch = entries[0];
            }

            done();
        }

        function test_measure(measureEntry, measureEntryCommand, expectedName, expectedStartTime, expectedDuration)
        {
            // test name
            test_true(measureEntry.name == expectedName, measureEntryCommand + ".name == \"" + expectedName + "\"");

            // test startTime; since for a mark, the startTime is always equal to a mark's value or the value of a
            // navigation timing attribute, the actual startTime should match the expected value exactly
            test_true(Math.abs(measureEntry.startTime - expectedStartTime) == 0,
                      measureEntryCommand + ".startTime is correct");

            // test entryType
            test_true(measureEntry.entryType == "measure", measureEntryCommand + ".entryType == \"measure\"");

            // test duration, allow for an acceptable threshold in the difference between the actual duration and the
            // expected value for the duration
            test_true(Math.abs(measureEntry.duration - expectedDuration) <= testThreshold, measureEntryCommand +
                      ".duration is approximately correct (up to " + testThreshold + "ms difference allowed)");
        }
    </script>
    </head>
    <body onload="onload_test();">
        <h1>Description</h1>
        <p>This test validates that the performance.measure() method is working properly when navigation timing
           attributes are used in place of mark names. This test creates the following measures to test this method:
            <ul>
                <li>"measure_nav_start_no_end": created using a measure() call with a navigation timing attribute
                    provided as the startMark and nothing provided as the endMark</li>
                <li>"measure_nav_start_mark_end": created using a measure() call with a navigation timing attribute
                    provided as the startMark and a mark name provided as the endMark</li>
                <li>"measure_mark_start_nav_end": created using a measure() call with a mark name provided as the
                    startMark and a navigation timing attribute provided as the endMark</li>
                <li>"measure_nav_start_nav_end":created using a measure() call with a navigation timing attribute
                    provided as both the startMark and endMark</li>
            </ul>
           After creating each measure, the existence of these measures is validated by calling
           performance.getEntriesByName() with each measure name
        </p>

        <div id="log"></div>
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