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<!DOCTYPE html>
<title>Background change from opaque to transparent during smooth scroll</title>
<link rel=help href="https://drafts.csswg.org/cssom-view/#dictdef-scrolltooptions">
<style>
#container {
width: 200px;
height: 200px;
overflow: scroll;
background: white;
}
#content {
width: 7500px;
height: 7500px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
var t = async_test('background change during smooth scroll');
function startSmoothScroll() {
var scrollToOptions = {behavior: "smooth", top: 6000};
container.scrollTo(scrollToOptions);
requestAnimationFrame(preventCompositedScrolling);
}
function preventCompositedScrolling() {
container.style.background = "transparent";
requestAnimationFrame(waitForSmoothScrollEnd);
}
function waitForSmoothScrollEnd() {
if (container.scrollTop == 6000) {
t.done();
} else {
window.requestAnimationFrame(waitForSmoothScrollEnd);
}
}
onload = () => {
requestAnimationFrame(startSmoothScroll);
}
</script>
<div id="container">
<div id="content">Content</div>
</div>
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