Source code
Revision control
Copy as Markdown
Other Tools
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<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/SimpleTest.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
#scroller {
height: 50vh;
overflow: scroll;
}
</style>
<div id="scroller">
<div style="height: 1000vh"></div>
</div>
<script>
async function test() {
const scrollendPromise = promiseScrollend(scroller);
// Do a scroll operation which will not run through the paint-skiping code path.
scroller.scrollBy(0, 1000);
await scrollendPromise;
await waitUntilApzStable();
const sampledData = collectSampledScrollOffsets(scroller);
ok(sampledData.length, "There should be at least one collected offsets");
sampledData.forEach(data => {
const scrollOffsetY = SpecialPowers.wrap(data).scrollOffsetY;
ok(scrollOffsetY == 1000 || scrollOffsetY == 0,
`${scrollOffsetY} should be either 0 or 1000`);
});
}
// We do intentionally not use waitUntilApzStable() since in this specific
// test we want to test a case where the is-first-paint metrics are initially NOT
// processed because the corresponding APZC hasn't been ready at that moment.
test().then(subtestDone, subtestFailed);
</script>
</html>