po-takeRecords.any.js

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /performance-timeline/po-takeRecords.any.html - WPT Dashboard Interop Dashboard
- /performance-timeline/po-takeRecords.any.worker.html - WPT Dashboard Interop Dashboard

// META: title=PerformanceObserver: takeRecords

// META: script=performanceobservers.js

async_test(function (t) {

    const observer = new PerformanceObserver(function (entryList, observer) {

      assert_unreached('This callback should not have been called.')

});

    let entries = observer.takeRecords();

    checkEntries(entries, [], 'No records before observe');

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

    assert_equals(typeof(observer.takeRecords), 'function');

    entries = observer.takeRecords();

    checkEntries(entries, [], 'No records just from observe');

    performance.mark('a');

    performance.mark('b');

    entries = observer.takeRecords();

    checkEntries(entries, [

      {entryType: 'mark', name: 'a'},

      {entryType: 'mark', name: 'b'}

]);

    performance.mark('c');

    performance.mark('d');

    performance.mark('e');

    entries = observer.takeRecords();

    checkEntries(entries, [

      {entryType: 'mark', name: 'c'},

      {entryType: 'mark', name: 'd'},

      {entryType: 'mark', name: 'e'}

]);

    entries = observer.takeRecords();

    checkEntries(entries, [], 'No entries right after takeRecords');

    observer.disconnect();

    t.done();

  }, "Test PerformanceObserver's takeRecords()");