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<!DOCTYPE html>
<title>Scroll 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 class=timeline>
<div id=target></div>
</div>
</template>
<template id=template_with_scope>
<div id=scope>
<div id=target></div>
<div id=scroller class=timeline>
<div></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');
let maxScroll = scroller.scrollHeight - scroller.clientHeight;
if (scope != null) {
scope.style.timelineScope = '--t1';
}
timeline.style.scrollTimeline = '--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';
let before_scroll = options.startOffset - 10;
if (before_scroll >= 0) {
await assertValueAt(scroller, target,
{ scrollTop: options.startOffset - 10, expected: -1 });
}
let after_scroll = options.startOffset + 10;
if (after_scroll <= scroller.maxmum) {
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: 0,
endOffset: 1500
});
test_animation_range({
rangeStart: '0%',
rangeEnd: '100%',
startOffset: 0,
endOffset: 1500
});
test_animation_range({
rangeStart: '10%',
rangeEnd: '100%',
startOffset: 150,
endOffset: 1500
});
test_animation_range({
rangeStart: '0%',
rangeEnd: '50%',
startOffset: 0,
endOffset: 750
});
test_animation_range({
rangeStart: '10%',
rangeEnd: '50%',
startOffset: 150,
endOffset: 750
});
test_animation_range({
rangeStart: '150px',
rangeEnd: '75em',
startOffset: 150,
endOffset: 750
});
test_animation_range({
rangeStart: 'calc(1% + 135px)',
rangeEnd: 'calc(70em + 50px)',
startOffset: 150,
endOffset: 750
});
// Test animation-range via timeline-scope.
test_animation_range({
rangeStart: 'calc(1% + 135px)',
rangeEnd: 'calc(70em + 50px)',
startOffset: 150,
endOffset: 750
}, template_with_scope, '(scoped)');
</script>
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