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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#named-range-animation-declaration">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<title>The animation-range-* CSS properties for an animation associated with a scroll timeline</title>
</head>
<style>
@keyframes anim {
from { opacity: 0 }
}
#scroller {
overflow-y: scroll;
width: 100px;
height: 100px;
}
#target {
width: 100%;
height: 200%;
animation: anim auto linear;
animation-timeline: scroll();
animation-range-start: 10px;
animation-range-end: 80px;
}
</style>
<body>
<div id="scroller">
<div id="target"></div>
</div>
</body>
<script>
const animation = document.getAnimations()[0];
test(t => {
assert_equals(animation.rangeStart.offset.value, 10);
assert_equals(animation.rangeStart.offset.unit, "px");
}, "The animation-range-start CSS property maps to Animation's 'rangeStart' property");
test(t => {
assert_equals(animation.rangeEnd.offset.value, 80);
assert_equals(animation.rangeEnd.offset.unit, "px");
}, "The animation-range-end CSS property maps to Animation's 'rangeEnd' property");
promise_test(async t => {
await animation.ready;
assert_percents_equal(animation.startTime, 10);
}, "The auto-aligned start time accounts for the animation-range-start property");
promise_test(async t => {
await animation.ready;
assert_percents_equal(animation.effect.getComputedTiming().duration, 70);
}, "The effect duration accounts for the animation-range-* properties");
</script>
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