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<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Wheel-scrolling over 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>
<script type="application/javascript">
async function test() {
var subframe = document.getElementById("scroll");
// scroll over the scrollbar, and make sure the subframe scrolls
var scrollPos = subframe.scrollTop;
if (subframe.clientWidth == 200) {
// No scrollbar, abort the test. This can happen e.g. on local macOS runs
// with OS settings to only show scrollbars on trackpad/mouse activity.
ok(false, "No scrollbars found, cannot run this test!");
var scrollbarX = (200 + subframe.clientWidth) / 2;
await promiseNativeWheelAndWaitForScrollEvent(subframe, scrollbarX, 100,
0, -10);
ok(subframe.scrollTop > scrollPos, "subframe scrolled after wheeling over scrollbar");
.then(subtestDone, subtestFailed);
#scroll {
width: 200px;
height: 200px;
overflow: scroll;
#scrolled {
width: 200px;
height: 1000px; /* so the subframe has room to scroll */
will-change: transform; /* to force active layers */
<div id="scroll">
<div id="scrolled"></div>