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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<title>A scroll linked effect scrolled by wheel events</title>
<style>
html, body { margin: 0; }
body {
height: 1000vh;
}
#target {
position: absolute;
height: 800px;
background-color: #cc00cc;
top: 0;
left: 0;
right: 0;
}
</style>
<div id="target"></div>
<script>
// Set up a scroll linked effect element.
window.addEventListener("scroll", () => {
target.style.top = window.scrollY + "px";
});
async function test() {
let rect = rectRelativeToScreen(target);
// We only care the top 10px here since the scroll linked effect on the
// main-thread can't keep up with the async scrolling by wheel events so that
// the position absolute element is often partially scrolled out.
rect.height = 10.0;
const initialSnapshot = await getSnapshot(rect);
let snapshots = [];
for (let i = 0; i < 10; i++) {
await synthesizeNativeWheel(window, 50, 50, 0, -10);
snapshots.push(await getSnapshot(rect));
}
const sampledData = collectSampledScrollOffsets(document.scrollingElement);
const hasPoint5FractionalOffset = sampledData.some(data => {
return SpecialPowers.wrap(data).scrollOffsetY.toString().split(".")?.[1] === "5"
});
if (hasPoint5FractionalOffset) {
todo(false, "Bug 1752789: There's at least one sampled scroll offset " +
"having .5 fractional part in such cases scroll linked effects can " +
"not be rendered at the same position of the async scroll offset");
return;
}
snapshots.forEach(snapshot => {
is(initialSnapshot, snapshot);
});
}
pushPrefs([["apz.test.logging_enabled", true]])
.then(waitUntilApzStable)
.then(test)
.then(subtestDone, subtestFailed);
</script>
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