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<!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, 'mousedown');
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>
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