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<html class="reftest-wait">
<title>Scroll timeline with Web Animation using a scroller with overflow hidden</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations/">
<meta name="assert" content="Web animation correctly updates values when using a overflow: hidden on the scroller being used as the source for the ScrollTimeline">
<link rel="match" href="animation-with-overflow-hidden-ref.html">
<script src="/web-animations/testcommon.js"></script>
<script src="/common/reftest-wait.js"></script>
<style>
#box {
width: 100px;
height: 100px;
background-color: green;
}
#covered {
width: 100px;
height: 100px;
background-color: red;
}
#scroller {
overflow: hidden;
height: 100px;
width: 100px;
}
#contents {
height: 1000px;
width: 100%;
}
</style>
<div id="box"></div>
<div id="covered"></div>
<div id="scroller">
<div id="contents"></div>
</div>
<script>
const box = document.getElementById('box');
const effect = new KeyframeEffect(box,
[
{transform: 'translateY(0)', opacity: 1},
{transform: 'translateY(200px)', opacity: 0}
]
);
const scroller = document.getElementById('scroller');
const timeline = new ScrollTimeline(
{ source: scroller, orientation: 'block' });
const animation = new Animation(effect, timeline);
animation.play();
animation.ready.then(() => {
// Move the scroller to the halfway point.
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.5 * maxScroll;
waitForAnimationFrames(2).then(_ => {
takeScreenshot();
});
});
</script>
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