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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
html {
overflow: hidden;
}
#spacer {
height: 200vh;
width: 200vw;
position: absolute;
background: linear-gradient(green, blue);
}
</style>
</head>
<body>
<div id="spacer"></div>
</body>
<script>
async function test() {
let scrollendCount = 0;
window.addEventListener("scrollend", () => {
scrollendCount += 1;
});
window.scrollTo({ top: window.scrollY, behavior: 'smooth' });
await promiseFrame();
is(scrollendCount, 0, "Scrollend is not fired for a main thread no-op smooth scroll");
window.scrollTo({ top: window.scrollY + 200, behavior: 'smooth' });
await promiseOneEvent(window, "scrollend");
is(scrollendCount, 1, "Scrollend is fired for a main thread smooth scroll");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>