| <!DOCTYPE html> |
| <style> |
| body { |
| height: 2000px; |
| width: 2000px; |
| } |
| </style> |
| |
| <script src="../../resources/ui-helper.js"></script> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script> |
| |
| function getUIScript() { |
| const pageScaleFactor = 2; |
| return `(function() { |
| uiController.zoomToScale(${pageScaleFactor}, function() { |
| uiController.uiScriptComplete(uiController.zoomScale); |
| }); |
| })();`; |
| } |
| |
| let numScrollEvents = 0; |
| window.visualViewport.addEventListener("scroll", event => numScrollEvents++); |
| |
| promise_test(async () => { |
| await UIHelper.waitForEvent(window, "load"); |
| await new Promise(resolve => testRunner.runUIScript(getUIScript(), resolve)); |
| |
| window.scrollTo(1000, 1000); |
| await UIHelper.ensureStablePresentationUpdate(); |
| await UIHelper.animationFrame(); |
| assert_not_equals(numScrollEvents, 0, "Calling window.scrollTo() caused 'scroll' events to be dispatched."); |
| |
| const numScrollEventsAfterScroll = numScrollEvents; |
| await UIHelper.animationFrame(); |
| assert_equals(numScrollEventsAfterScroll, numScrollEvents, "There were no additional scroll events after scrolling."); |
| }, "Verify that a scroll event gets fired on window.visualViewport when its offset changes but not after the scroll has completed."); |
| |
| </script> |
