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<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Test for scenario in bug 1228407 with two scrollframes</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() {
let utils = SpecialPowers.getDOMWindowUtils(window);
// Basically the same setup as in helper_smoothscroll_spam.html, but
// with two scrollframes that get scrolled in an interleaved manner.
// The original fix for bug 1228407 left this scenario unhandled, with
// bug 1231177 tracking the problem. This test exercises the scenario.
let s1 = document.getElementById('s1');
let s2 = document.getElementById('s2');
for (let i = 0; i < 100; i++) {
s1.scrollBy({top:60, behavior: "smooth"});
s2.scrollBy({top:60, behavior: "smooth"});
await promiseOnlyApzControllerFlushed();
await promiseOnlyApzControllerFlushed();
let s1pos = s1.scrollTop;
let s2pos = s2.scrollTop;
ok(s1pos > 60, `s1 scrolled ${s1pos}px, should be more than 60`);
ok(s2pos > 60, `s2 scrolled ${s2pos}px, should be more than 60`);
waitUntilApzStable().then(test).then(subtestDone, subtestFailed);
.scrollable {
overflow: scroll;
height: 300px;
.content {
height: 1000px;
background-image: linear-gradient(green, blue);
<div id="s1" class="scrollable"><div class="content"></div></div>
<div id="s2" class="scrollable"><div class="content"></div></div>