44 lines
2 KiB
HTML
44 lines
2 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta charset=utf-8 />
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<title>Event Timing: PerformanceObserver with buffered flag and durationThreshold</title>
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<script src=/resources/testharness.js></script>
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<script src=/resources/testharnessreport.js></script>
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<script src=/resources/testdriver.js></script>
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<script src=/resources/testdriver-vendor.js></script>
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<script src=resources/event-timing-test-utils.js></script>
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<div id='myDiv'>Click me</div>
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<script>
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promise_test(async t => {
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assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
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// Add a PerformanceObserver and observe with a durationThreshold of 30 and buffered flag.
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return new Promise(async resolve1 => {
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// Add a slow click event and make sure it's dispatched to observers.
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await new Promise(async resolve2 => {
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// Observer to await until event entry is dispatched.
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new PerformanceObserver(() => {
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resolve2();
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}).observe({type: "event", durationThreshold: 16});
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await clickAndBlockMain('myDiv', { duration: 30 });
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});
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const afterFirstClick = performance.now();
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new PerformanceObserver(t.step_func(list => {
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const pointerDowns = list.getEntriesByName('pointerdown');
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pointerDowns.forEach(entry => {
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if (entry.processingStart < afterFirstClick) {
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// It is possible that the first event gets a slow duration and hence gets buffered.
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// In this case the minDuration must be at least 104, otherwise it shouldn't have been
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// buffered.
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verifyClickEvent(entry, 'myDiv', true /* isFirst */);
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} else {
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verifyClickEvent(pointerDowns[0], 'myDiv', false /* isFirst */, 16 /* minDuration*/);
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resolve1();
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}
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});
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})).observe({type: 'event', durationThreshold: 16, buffered: true});
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// This should be the only click observed since the other one would not be buffered.
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await clickAndBlockMain('myDiv', { duration: 30 } );
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});
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}, "PerformanceObserver buffering independent of durationThreshold");
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</script>
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</html>
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