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<!DOCTYPE html>
<html class="reftest-wait">
<title>Add background-attachment:fixed during smooth scroll</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dictdef-scrolltooptions">
<link rel="match" href="add-background-attachment-fixed-during-smooth-scroll-ref.html">
<meta name="fuzzy" content="maxDifference=0-2; totalPixels=0-27000">
<script src="/common/reftest-wait.js"></script>
<style>
#container {
width: 200px;
height: 200px;
overflow: scroll;
background: linear-gradient(green, blue);
will-change: scroll-position;
}
#content {
width: 7500px;
height: 7500px;
}
</style>
<script>
function startSmoothScroll() {
var scrollToOptions = {behavior: "smooth", top: 6000};
container.scrollTo(scrollToOptions);
requestAnimationFrame(preventCompositedScrolling);
}
function preventCompositedScrolling() {
container.style.backgroundAttachment = "fixed";
requestAnimationFrame(waitForSmoothScrollEnd);
}
function waitForSmoothScrollEnd() {
if (container.scrollTop == 6000) {
takeScreenshot();
} else {
window.requestAnimationFrame(waitForSmoothScrollEnd);
}
}
onload = () => {
requestAnimationFrame(startSmoothScroll);
}
</script>
<div id="container">
<div id="content">Content</div>
</div>
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