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<!DOCTYPE html>
<title>View timelines and animation attachment ranges</title>
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#named-timeline-range">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#animation-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>
<style>
@keyframes anim {
from { z-index: 0; background-color: skyblue;}
to { z-index: 100; background-color: coral; }
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
width: 200px;
height: 200px;
}
#scroller > div {
margin: 800px 0px;
width: 100px;
height: 100px;
}
#target {
font-size: 10px;
background-color: green;
z-index: -1;
}
</style>
<main id=main>
</main>
<template id=template_without_scope>
<div id=scroller>
<div id=target class=timeline></div>
</div>
</template>
<template id=template_with_scope>
<div id=scope>
<div id=target></div>
<div id=scroller>
<div class=timeline></div>
</div>
</div>
</template>
<script>
setup(assert_implements_animation_timeline);
function inflate(t, template) {
t.add_cleanup(() => main.replaceChildren());
main.append(template.content.cloneNode(true));
}
async function scrollTop(e, value) {
e.scrollTop = value;
await waitForNextFrame();
}
async function waitForAnimationReady(target) {
await waitForNextFrame();
await Promise.all(target.getAnimations().map(x => x.ready));
}
async function assertValueAt(scroller, target, args) {
await waitForAnimationReady(target);
await scrollTop(scroller, args.scrollTop);
assert_equals(getComputedStyle(target).zIndex, args.expected.toString());
}
function test_animation_range(options, template, desc_suffix) {
if (template === undefined)
template = template_without_scope;
if (desc_suffix === undefined)
desc_suffix = '';
promise_test(async (t) => {
inflate(t, template);
let scroller = main.querySelector('#scroller');
let target = main.querySelector('#target');
let timeline = main.querySelector('.timeline');
let scope = main.querySelector('#scope');
if (scope != null) {
scope.style.timelineScope = '--t1';
}
timeline.style.viewTimeline = '--t1';
target.style.animation = 'anim auto linear';
target.style.animationTimeline = '--t1';
target.style.animationRangeStart = options.rangeStart;
target.style.animationRangeEnd = options.rangeEnd;
// Accommodates floating point precision errors at the endpoints.
target.style.animationFillMode = 'both';
// 0%
await assertValueAt(scroller, target,
{ scrollTop: options.startOffset, expected: 0 });
// 50%
await assertValueAt(scroller, target,
{ scrollTop: (options.startOffset + options.endOffset) / 2, expected: 50 });
// 100%
await assertValueAt(scroller, target,
{ scrollTop: options.endOffset, expected: 100 });
// Test before/after phases (need to clear the fill mode for that).
target.style.animationFillMode = 'initial';
await assertValueAt(scroller, target,
{ scrollTop: options.startOffset - 10, expected: -1 });
await assertValueAt(scroller, target,
{ scrollTop: options.endOffset + 10, expected: -1 });
// Check 50% again without fill mode.
await assertValueAt(scroller, target,
{ scrollTop: (options.startOffset + options.endOffset) / 2, expected: 50 });
}, `Animation with ranges [${options.rangeStart}, ${options.rangeEnd}] ${desc_suffix}`.trim());
}
test_animation_range({
rangeStart: 'initial',
rangeEnd: 'initial',
startOffset: 600,
endOffset: 900
});
test_animation_range({
rangeStart: 'cover 0%',
rangeEnd: 'cover 100%',
startOffset: 600,
endOffset: 900
});
test_animation_range({
rangeStart: 'contain 0%',
rangeEnd: 'contain 100%',
startOffset: 700,
endOffset: 800
});
test_animation_range({
rangeStart: 'entry 0%',
rangeEnd: 'entry 100%',
startOffset: 600,
endOffset: 700
});
test_animation_range({
rangeStart: 'exit 0%',
rangeEnd: 'exit 100%',
startOffset: 800,
endOffset: 900
});
test_animation_range({
rangeStart: 'contain -50%',
rangeEnd: 'entry 200%',
startOffset: 650,
endOffset: 800
});
test_animation_range({
rangeStart: 'entry 0%',
rangeEnd: 'exit 100%',
startOffset: 600,
endOffset: 900
});
test_animation_range({
rangeStart: 'cover 20px',
rangeEnd: 'cover 100px',
startOffset: 620,
endOffset: 700
});
test_animation_range({
rangeStart: 'contain 20px',
rangeEnd: 'contain 100px',
startOffset: 720,
endOffset: 800
});
test_animation_range({
rangeStart: 'entry 20px',
rangeEnd: 'entry 100px',
startOffset: 620,
endOffset: 700
});
test_animation_range({
rangeStart: 'entry-crossing 20px',
rangeEnd: 'entry-crossing 100px',
startOffset: 620,
endOffset: 700
});
test_animation_range({
rangeStart: 'exit 20px',
rangeEnd: 'exit 80px',
startOffset: 820,
endOffset: 880
});
test_animation_range({
rangeStart: 'exit-crossing 20px',
rangeEnd: 'exit-crossing 80px',
startOffset: 820,
endOffset: 880
});
test_animation_range({
rangeStart: 'contain 20px',
rangeEnd: 'contain calc(100px - 10%)',
startOffset: 720,
endOffset: 790
});
test_animation_range({
rangeStart: 'exit 2em',
rangeEnd: 'exit 8em',
startOffset: 820,
endOffset: 880
});
// Test animation-range via timeline-scope.
test_animation_range({
rangeStart: 'exit 2em',
rangeEnd: 'exit 8em',
startOffset: 820,
endOffset: 880
}, template_with_scope, '(scoped)');
</script>
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