author Cosmin Sabou <>
Sun, 05 Feb 2023 19:37:33 +0000
changeset 651812 d8601249f1eb8c52c742b0c19c9ca0fa8f2e31fe
parent 572521 ed5c38a59629d53b960a6973b4d16b8b959884f8
permissions -rw-r--r--
Bug 1806090 - temporarily disable browser_quickactions.js on linux for frequent failures. r=intermittent-reviewers,MasterWayZ Differential Revision:

  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width; initial-scale=1.0">
  <title>Dragging the mouse on the viewport's scrollbar</title>
  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
    .content {
      width: 1000px;
      height: 5000px;
  <script type="text/javascript">

async function test() {
  let scrollPromise = new Promise(resolve => {
    window.addEventListener("scroll", resolve, {once: true});

  // Do the scroll in one increment so that when the scroll event fires
  // we're done all the scrolling we're going to do.
  var dragFinisher = await promiseVerticalScrollbarDrag(window, 20, 20);
  if (!dragFinisher) {
    ok(true, "No scrollbar, can't do this test");

  // the events above might be stuck in APZ input queue for a bit until the
  // layer is activated, so we wait here until the scroll event listener is
  // triggered.
  await scrollPromise;

  await dragFinisher();

  // Flush everything just to be safe
  await promiseOnlyApzControllerFlushed();

  // After dragging the scrollbar 20px on a 1000px-high viewport, we should
  // have scrolled approx 2% of the 5000px high content. There might have been
  // scroll arrows and such so let's just have a minimum bound of 50px to be safe.
  ok(window.scrollY > 50, "Scrollbar drag resulted in a vertical scroll position of " + window.scrollY);

  // Check that we did not get spurious horizontal scrolling, as we might if the
  // drag gesture is mishandled by content as a select-drag rather than a scrollbar
  // drag.
  is(window.scrollX, 0, "Scrollbar drag resulted in a horizontal scroll position of " + window.scrollX);

.then(subtestDone, subtestFailed);

  <div class="content">Some content to ensure the root scrollframe is scrollable</div>