document-level-wheel-event-listener-passive-by-default.html

<!DOCTYPE html>
<title>Default passive document level wheel event listener 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/gesture-util.js"></script>
<body onload=runTest()>
<div id="wheelDiv">
</div>
</body>
<style>
#wheelDiv {
  width: 100px;
  height: 100px;
}
</style>
<script>
var wheel_div = document.getElementById("wheelDiv");
var rect = wheel_div.getBoundingClientRect();
var x = rect.left + rect.width / 2;
var y = rect.top + rect.height / 2;
var cancelable = true;
var wheel_arrived = false;
document.addEventListener("wheel", function (event) {
    cancelable = event.cancelable;
    wheel_arrived = true;
    event.preventDefault();
});

function injectInput() {
  return smoothScroll(10, x, y, GestureSourceType.MOUSE_INPUT, "down");
}

function runTest() {
  promise_test (async () => {
    await waitForCompositorCommit();
    await injectInput();
    await waitFor(()=> { return wheel_arrived; });
    assert_false(cancelable);
  }, "Wheel events are non-cancelable since the event listener is treated as passive.");
}
</script>

chromium/third_party/blink/web_tests/fast/scrolling/document-level-wheel-event-listener-passive-by-default.html