| <!DOCTYPE html> |
| <html> |
| <meta charset=utf-8 /> |
| <meta name="timeout" content="long"> |
| <title>Event Timing: eventCounts.</title> |
| <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/testdriver-actions.js></script> |
| <script src=/page-visibility/resources/window_state_context.js></script> |
| <script src=resources/event-timing-test-utils.js></script> |
| |
| <body> |
| <button id='target'>Click me</button> |
| |
| <script> |
| let observedEntries = []; |
| const map = new Map(); |
| const events = ['pointerdown']; |
| |
| promise_test(async t => { |
| assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.'); |
| |
| const { minimize, restore } = window_state_context(t); |
| const button = document.getElementById('target'); |
| |
| const callback = (entryList) => { observedEntries = observedEntries.concat(entryList.getEntries().filter(filterAndAddToMap(events, map))); }; |
| const readyToResolve = () => { return observedEntries.length >= 1; }; |
| const observerPromise = createPerformanceObserverPromise(['event'], callback, readyToResolve); |
| |
| const tapEventPromise = new Promise(resolve => { |
| button.addEventListener('pointerdown', async (event) => { |
| document.body.innerText += "Adding content to force rendering"; |
| |
| // await here will yield to event loop, and end event processing time, |
| // which will allow rendering to continue. |
| // The visibility change may happen before rendering has a chance |
| // but it is not guarenteed which will happen first. |
| await minimize(); |
| const timeAfterVisibilityFalse = performance.now(); |
| |
| await restore(); |
| const timeAfterVisibilityTrue = performance.now(); |
| |
| resolve({ timeAfterVisibilityFalse, timeAfterVisibilityTrue }); |
| }); |
| }); |
| |
| // A buffered visibility-state PerformanceEntry would have made this test |
| // cleaner, due to the variability of ordering of events, but it is not |
| // yet available. |
| const visibilityEventPromise = new Promise(resolve => { |
| document.addEventListener('visibilitychange', (event) => { |
| if (document.visibilityState !== 'visible') { |
| resolve(performance.now()); |
| } |
| }); |
| }); |
| |
| const timeBeforeTap = performance.now(); |
| await interactAndObserve('tap', button, observerPromise); |
| |
| // The order that these events fire is non-deterministic, but we can await |
| // the result of the promise in any order. |
| const { timeAfterVisibilityFalse, timeAfterVisibilityTrue } = await tapEventPromise; |
| const timeOfVisibilityFalse = await visibilityEventPromise; |
| |
| assert_equals(observedEntries.length, 1, "Pointerdown was measured"); |
| const entry = observedEntries[0]; |
| |
| assert_not_equals(timeBeforeTap, undefined); |
| assert_not_equals(timeAfterVisibilityFalse, undefined); |
| assert_not_equals(timeAfterVisibilityTrue, undefined); |
| assert_not_equals(timeOfVisibilityFalse, undefined); |
| |
| assert_less_than( |
| entry.processingEnd, |
| timeOfVisibilityFalse, |
| "event handler ends before visibility event fires" |
| ); |
| assert_less_than( |
| timeOfVisibilityFalse, |
| timeAfterVisibilityFalse, |
| "visibility event fires before event handler continues" |
| ); |
| assert_less_than_equal( |
| entry.startTime + entry.duration, |
| timeAfterVisibilityFalse, |
| "event duration ends before visibility is changed" |
| ); |
| |
| }, "Event handlers which change visibility should not measure next paint."); |
| |
| </script> |
| </body> |
| |
| </html> |