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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#named-timeline-range">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="support/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<title>Animation range 'normal' is equivalent to animation range 'cover'</title>
</head>
<style type="text/css">
@keyframes anim-1 {
from { background-color: blue; }
to { background-color: white; }
}
@keyframes anim-2 {
from { opacity: 0.3; }
to { opacity: 1; }
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
overflow-x: hidden;
width: 300px;
height: 200px;
}
#target {
margin-top: 800px;
margin-bottom: 800px;
margin-left: 10px;
margin-right: 10px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
animation: anim-1 auto linear, anim-2 auto linear;
animation-range: normal, cover;
view-timeline: --t1;
animation-timeline: --t1, --t1;
}
</style>
<body>
<div id="scroller">
<div id="target"></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
function assert_range_equals(actual, expected) {
if (typeof expected == 'string') {
assert_equals(actual, expected);
} else {
assert_equals(actual.rangeName, expected.rangeName);
assert_equals(actual.offset.value, expected.offset.value);
}
}
promise_test(async t => {
anims = target.getAnimations();
assert_equals(anims.length, 2, "Expecting 2 animations");
await anims[0].ready;
await anims[1].ready;
assert_range_equals(anims[0].rangeStart, "normal");
assert_range_equals(anims[0].rangeEnd, "normal");
assert_range_equals(anims[1].rangeStart,
{ rangeName: 'cover', offset: CSS.percent(0) });
assert_range_equals(anims[1].rangeEnd,
{ rangeName: 'cover', offset: CSS.percent(100) });
scroller.scrollTop = 600; // Start boundary for cover range.
await waitForNextFrame();
assert_percents_equal(anims[0].currentTime, 0,
'currentTime at start of normal range');
assert_percents_equal(anims[1].currentTime, 0,
'currentTime at cover 0%');
scroller.scrollTop = 900; // End boundary for cover range.
await waitForNextFrame();
assert_percents_equal(anims[0].currentTime, 100,
'currentTime at end of normal range');
assert_percents_equal(anims[1].currentTime, 100,
'currentTime at cover 100%');
}, 'Changing the animation range updates the play state');
}
window.onload = runTest;
</script>
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