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<!DOCTYPE html>
<title>ViewTimeline vs. scroll-padding-*</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#view-timelines">
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#view-progress-visibility-range">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="/scroll-animations/view-timelines/testcommon.js"></script>
<style>
#container {
border: 10px solid lightgray;
overflow-y: scroll;
height: 200px;
width: 200px;
scroll-padding: 40px;
}
.spacer {
height: 800px;
}
#target {
background-color: green;
height: 200px;
width: 100px;
}
</style>
<body>
<div id="container">
<div id="leading-space" class="spacer"></div>
<div id="target"></div>
<div id="trailing-space" class="spacer"></div>
</div>
</body>
<script>
promise_test(async t => {
container.scrollTop = 0;
await waitForNextFrame();
const anim = CreateViewTimelineOpacityAnimation(t, target);
await anim.ready;
// 0%
container.scrollTop = 600;
await waitForNextFrame();
assert_percents_equal(anim.currentTime, 0);
// 50%
container.scrollTop = 800;
await waitForNextFrame();
assert_percents_equal(anim.currentTime, 50);
// 100%
container.scrollTop = 1000;
await waitForNextFrame();
assert_percents_equal(anim.currentTime, 100);
}, 'Default ViewTimeline is not affected by scroll-padding');
</script>
</html>
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