helper_wheelevents_handoff_on_iframe.html

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<head>

  <meta name="viewport" content="width=device-width; initial-scale=1.0">

  <title>Test that wheel events on an unscrollable OOP iframe are handoff-ed</title>

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

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

  <script src="/tests/SimpleTest/paint_listener.js"></script>

  <style>

  iframe {

    height: 201px;

    border: none;

  </style>

</head>

<body>

  <div id="iframe-container" style="overflow-y: scroll; height: 200px;">

    <iframe src="https://example.com/tests/gfx/layers/apz/test/mochitest/helper_wheelevents_handoff_on_iframe_child.html"></iframe>

  </div>

  <div style="height: 200vh;"></div>

  <script type="application/javascript">

async function test() {

  const scrollContainer = document.querySelector("#iframe-container");

  let scrollEventPromise = waitForScrollEvent(scrollContainer);

  // Send a wheel event on the iframe.

  const iframe = document.querySelector("iframe");

  await synthesizeNativeWheel(iframe, 50, 50, 0, -50);

  await scrollEventPromise;

  // The wheel event should be handoff-ed to the parent scroll container.

  is(scrollContainer.scrollTop, scrollContainer.scrollTopMax,

     "The scroll position in the parent scroll container should be at the bottom");

  // Make sure the wheel event wasn't handoff-ed to the root scroller.

  is(window.scrollY, 0, "The root scroll position should be 0");

  await promiseFrame();

  scrollEventPromise = waitForScrollEvent(window);

  // Send a wheel event on the iframe again.

  await synthesizeNativeWheel(iframe, 50, 50, 0, -50);

  await scrollEventPromise;

  // Now it should be handoff-ed to the root scroller.

  ok(window.scrollY > 0,

     "The wheel event should have been handoff-ed to the root scroller");

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

  </script>

</body>