| <!DOCTYPE html> |
| <html> |
| <meta charset=utf-8 /> |
| <title>Event Timing: buffer long-latency events before onload</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-support.js></script> |
| |
| <script> |
| /* Timeline: |
| Onload |
| PerformanceObserver is registered |
| Click 1 |
| Click 2 |
| PerformanceObserver should observe only one firstInput entry. |
| (Dispatch and Process Click 2 - not buffered) |
| */ |
| async_test(function(t) { |
| let numFirstInputObserved = 0; |
| let numEventsObserved = 0; |
| new PerformanceObserver(t.step_func((entryList, obs) => { |
| const observedEntries = entryList.getEntries().filter( |
| entry => entry.name === 'mousedown'); |
| numEventsObserved += observedEntries.filter(entry => |
| entry.entryType == 'event').length; |
| numFirstInputObserved += observedEntries.filter(entry => |
| entry.entryType == 'firstInput').length; |
| if (numEventsObserved >= 2) { |
| assert_equals(performance.getEntriesByType('event').length, 0, |
| "There should be no buffered event entries."); |
| assert_equals(performance.getEntriesByType('firstInput').length, 1, |
| "There should be a buffered firstInput entry."); |
| // There should be 2 event entries and one firstInput entry. |
| assert_equals(numEventsObserved, 2, |
| "There should be 2 observed event entries."); |
| assert_equals(numFirstInputObserved, 1, |
| "There should be only 1 observed firstInput entry."); |
| t.done(); |
| } |
| })).observe({ entryTypes: ['event', 'firstInput'] }); |
| on_event(window, 'load', () => { |
| clickAndBlockMain('button').then(() => { |
| clickAndBlockMain('button'); |
| }); |
| }); |
| }, |
| "Event Timing: check firstInput after onload, observer, click, click." |
| ); |
| </script> |
| </html> |
