retrieve-firstInput.html

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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:
- /event-timing/retrieve-firstInput.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<meta charset=utf-8 />

<title>Event Timing: first-input entry should be buffered even without observer</title>

<button id='button'>Generate a 'click' event</button>

<script src=/resources/testharness.js></script>

<script src=/resources/testharnessreport.js></script>

<script src=/resources/testdriver.js></script>

<script src=/resources/testdriver-vendor.js></script>

<script src=resources/event-timing-test-utils.js></script>

<script>

  async_test(function(t) {

    assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');

    function testEntries() {

      // First callback is not ensured to have the entry.

      if (performance.getEntriesByType('first-input').length === 0) {

        t.step_timeout(testEntries, 10);

        return;

      assert_equals(performance.getEntriesByType('first-input').length, 1,

        "There should be a first-input entry in the performance timeline");

      const entry = performance.getEntriesByType('first-input')[0];

      assert_equals(entry.name, 'pointerdown');

      assert_equals(entry.entryType, 'first-input');

      assert_greater_than_equal(entry.duration, 104,

        "The first input was a long one.");

      t.done();

    clickAndBlockMain('button').then(wait).then(t.step_func(testEntries));

},

  "Event Timing: check first-input after onload, observer, click, click."

);

</script>

</html>