| <!DOCTYPE html> |
| <title>Default passive document level wheel event listener manual test</title> |
| <link rel="help" href="https://github.com/WICG/interventions/issues/64"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/testdriver.js"></script> |
| <script src="/resources/testdriver-actions.js"></script> |
| <script src="/resources/testdriver-vendor.js"></script> |
| <body onload=runTest()> |
| <div>This is a manual test since there is no way to synthesize wheel events. |
| Scroll by wheel in the middle of the page to run the test.</div> |
| </body> |
| <script> |
| var cancelable = true; |
| var wheel_arrived = false; |
| document.addEventListener("wheel", function (event) { |
| cancelable = event.cancelable; |
| wheel_arrived = true; |
| event.preventDefault(); |
| }); |
| |
| function waitFor(condition) { |
| const MAX_FRAME = 200; |
| return new Promise((resolve, reject) => { |
| function tick(frames) { |
| // We requestAnimationFrame either for 200 frames or until condition is |
| // met. |
| if (frames >= MAX_FRAME) |
| reject("Condition did not become true after 200 frames"); |
| else if (condition()) |
| resolve(); |
| else |
| requestAnimationFrame(tick.bind(this, frames + 1)); |
| } |
| tick(0); |
| }); |
| } |
| |
| function runTest() { |
| promise_test (async () => { |
| const pos_x = Math.floor(window.innerWidth / 2); |
| const pos_y = Math.floor(window.innerHeight / 2); |
| const delta_x = 0; |
| const delta_y = 100; |
| await new test_driver.Actions() |
| .scroll(pos_x, pos_y, delta_x, delta_y).send(); |
| await waitFor(()=> { return wheel_arrived; }); |
| assert_false(cancelable); |
| }, "Wheel events are non-cancelable since the event listener is treated as passive."); |
| } |
| </script> |
