wheel-event-transactions-target-elements.html

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This WPT test may be referenced by the following Test IDs:
- /dom/events/scrolling/wheel-event-transactions-target-elements.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">

<link rel="stylesheet" type="text/css" href="/fonts/ahem.css"/>

<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 src="scroll_support.js"></script>

<style>

body {

  margin: 0;

  padding: 0;

  height: 200vh;

.spacer {

  width: 100%;

  height: 25px;

  padding: 0;

  margin: 0;

  font: 25px/1 Ahem;

</style>

<head>

<body>

<div id="firstRootSpacer" class="spacer" style="background: green">X</div>

<div id="secondRootSpacer" class="spacer" style="background: blue"></div>

</body>

<script>

promise_test(async (t) => {

  // Wheel event transactions target elements, not nodes. A wheel event

  // transaction that begins over a text node should have an event target for

  // the containing element.

  await waitForCompositorReady();

  await waitForCompositorCommit();

  let wheelEventTargets = [];

  window.addEventListener("wheel", (e) => {

    wheelEventTargets.push(e.target);

  }, {passive: true});

  await waitForCompositorCommit();

  await new test_driver.Actions()

    .addWheel("wheel1")

    .scroll(12, 12, 0, 30, {origin: "viewport"})

    .pause(1)

    .scroll(12, 12, 0, 30, {origin: "viewport"})

    .send();

  // TODO(dlrobertson): Use the scrollend event here to wait for the

  // wheel scroll to finish instead of waitForAnimationEnd().

  await waitForAnimationEnd(() => { return document.scrollingElement.scrollTop; });

  await waitForCompositorCommit();

  // All of the wheel events should have the first div as their target.

  wheelEventTargets.forEach((wheelEventTarget, i) => {

    assert_equals(wheelEventTarget, firstRootSpacer,

                  "Wheel event at index `" + i + "` does not have the expected target");

});

  assert_greater_than(document.scrollingElement.scrollTop, 0, "The document has scrolled");

}, "Wheel event transactions target elements");

</script>

</html>