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<!DOCTYPE html>
<html class="reftest-wait reftest-snapshot-all reftest-no-flush" reftest-async-scroll
reftest-async-scroll-y="200">
<head>
<title>Check that the apz.disable_for_sle_pages pref behaves as expected</title>
<script>
// Upon load, this page invokes scrollTo() for a transparent element
// repeatedly. It triggers scroll events, which run the scroll listener
// below. The scroll listener updates the background-position-x of the div
// to make the div a scroll-linked-effect. The scroll-linked effect detector
// should then report that the document contains such an effect, which will
// disable APZ on the page. That in turn will cause the
// reftest-async-scroll-y to get ignored, and that's what the reftest checks
// for.
function start() {
let scrollPosition = 1;
scroller.addEventListener('scroll', function() {
// NOTE: Changing background-position-x doesn't change rendering for
// this element.
document.getElementById('scroll-linked-effect').style.backgroundPositionX =
scroller.scrollTop + "px";
if (scrollPosition == 1) {
setTimeout(done, 0);
}
scrollPosition++;
scroller.scrollTo(0, scrollPosition);
});
scroller.scrollTo(0, scrollPosition);
}
addEventListener('load', start, false);
function done() {
document.documentElement.classList.remove('reftest-wait');
}
</script>
</head>
<body style="height: 5000px; background-image:url(repeatable-diagonal-gradient.png);">
<div id="scroller" style="overflow: auto; width: 100px; height: 100px; scrollbar-width: none;">
<div style="height: 5000px;"></div>
</div>
<div id="scroll-linked-effect" style="position: absolute; top: 100px; left: 100px; width: 100px; height: 100px; background-color: green"></div>
</body>
</html>
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