buffered-flag.window.js

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /longtask-timing/buffered-flag.window.html - WPT Dashboard Interop Dashboard

// META: script=resources/utils.js

async_test(t => {

    assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');

    new PerformanceObserver(t.step_func((entryList, obs) => {

        const observer = new PerformanceObserver(t.step_func_done(list => {

            let longtaskObserved = false;

            list.getEntries().forEach(entry => {

                if (entry.entryType === 'mark')

                    return;

                checkLongTaskEntry(entry);

                longtaskObserved = true;

});

            assert_true(longtaskObserved, 'Did not observe buffered longtask.');

        }));

        observer.observe({type: 'longtask', buffered: true});

        // Observer mark so that we can flush the observer callback.

        observer.observe({type: 'mark'});

        performance.mark('m');

        // Disconnect the embedding observer so this callback only runs once.

        obs.disconnect();

    })).observe({entryTypes: ['longtask']});

    // Create a long task.

    const begin = window.performance.now();

    while (window.performance.now() < begin + 60);

}, 'PerformanceObserver with buffered flag can see previous longtask entries.');