wheel-multiple-sources-deadlock.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /uievents/order-of-events/mouse-events/wheel-multiple-sources-deadlock.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Wheel Event Coalescing Deadlock Test</title>

<link rel=help href="https://github.com/servo/servo/pull/43202">

<link rel="author" title="Euclid Ye" href="mailto:yezhizhenjiakang@gmail.com">

<meta name="assert" content="The page should not deadlock when multiple wheel sources are active simultaneously.">

<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>

<script>

promise_test(async () => {

  let totalDeltaX = 0;

  let totalDeltaY = 0;

  document.addEventListener('wheel', (e) => {

    totalDeltaX += e.deltaX;

    totalDeltaY += e.deltaY;

});

  await new test_driver.Actions()

    .addWheel("wheel1")

    .addWheel("wheel2")

    .scroll(0, 0, 0, 50, { origin: "viewport", sourceName: "wheel1", duration: 250 })

    .scroll(0, 0, 50, 0, { origin: "viewport", sourceName: "wheel2", duration: 250 })

    .send();

  assert_approx_equals(totalDeltaY, 50, 0.1, "Vertical delta from wheel1 must be processed.");

  assert_approx_equals(totalDeltaX, 50, 0.1, "Horizontal delta from wheel2 must be processed.");

}, "Simultaneous wheel events in different directions should not deadlock.");

</script>