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<!DOCTYPE html>
<title>Changes to view-timeline are reflected in dependent elements</title>
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#view-timeline-shorthand">
<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; }
to { z-index: 100; }
}
.scroller {
overflow: hidden;
width: 100px;
height: 100px;
}
.scroller > div {
height: 100px;
}
#target {
height: 0px;
z-index: -1;
}
</style>
<main id=main></main>
<script>
setup(assert_implements_animation_timeline);
function inflate(t, template) {
t.add_cleanup(() => main.replaceChildren());
main.append(template.content.cloneNode(true));
main.offsetTop;
}
async function scrollTop(e, value) {
e.scrollTop = value;
await waitForNextFrame();
}
async function scrollLeft(e, value) {
e.scrollLeft = value;
await waitForNextFrame();
}
</script>
<template id=dynamic_view_timeline_attachment>
<style>
#scroller {
timeline-scope: --t1;
}
.timeline {
view-timeline: --t1;
}
#target {
animation: anim 1s linear;
animation-timeline: --t1;
}
</style>
<div id=scroller class=scroller>
<div id=div75></div>
<div id=div25></div>
<div id=div_before></div>
<div id=target></div>
</div>
</template>
<script>
promise_test(async (t) => {
inflate(t, dynamic_view_timeline_attachment);
await scrollTop(scroller, 50);
// scrollTop=50 is 75% for div75.
div75.classList.add('timeline');
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '75', 'div75');
// Identical timelines in div75 and div25 creates an ambiguity.
div25.classList.add('timeline');
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '-1', 'ambiguous');
// Removing the timeline from div75 unambiguously links div25 to the
// timeline, making scrollTop=50 at 25% for div25.
div75.classList.remove('timeline');
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '25', 'div25');
// scrollTop=50 is before the timeline start for div_before.
div25.classList.remove('timeline');
div_before.classList.add('timeline');
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '-1', 'ahead of div_before');
// Scroll to 25% (for div_before) to verify that we're linked to that
// timeline.
await scrollTop(scroller, 150);
assert_equals(getComputedStyle(target).zIndex, '25', 'div_before');
// Linking the timeline back to div25 verifies that the new scrollTop=150 is
// actually at 75%.
div_before.classList.remove('timeline');
div25.classList.add('timeline');
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '75', 'div25 again');
}, 'Dynamically changing view-timeline attachment');
</script>
<template id=dynamic_view_timeline_axis>
<style>
#timeline {
view-timeline: --t1;
width: 100px;
height: 100px;
margin: 100px;
}
#target {
animation: anim 1s linear;
animation-timeline: --t1;
}
</style>
<div id=scroller class=scroller>
<div id=timeline style="background: red;">
<div id=target></div>
</div>
</div>
</template>
<script>
promise_test(async (t) => {
inflate(t, dynamic_view_timeline_axis);
await scrollTop(scroller, 50); // 25% (vertical)
await scrollLeft(scroller, 20); // 10% (horizontal)
assert_equals(getComputedStyle(target).zIndex, '25', 'vertical');
timeline.style.viewTimelineAxis = 'x';
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '10', 'horizontal');
}, 'Dynamically changing view-timeline-axis');
</script>
<template id=dynamic_view_timeline_inset>
<style>
#timeline {
width: 100px;
height: 100px;
margin: 100px;
view-timeline: --t1;
}
#target {
animation: anim 1s linear;
animation-timeline: --t1;
}
</style>
<div id=scroller class=scroller>
<div id=timeline style="background: red;">
<div id=target></div>
</div>
</div>
</template>
<script>
promise_test(async (t) => {
inflate(t, dynamic_view_timeline_inset);
await scrollTop(scroller, 50); // 25% (without inset).
assert_equals(getComputedStyle(target).zIndex, '25', 'without inset');
timeline.style.viewTimelineInset = '0px 50px';
await waitForCSSScrollTimelineStyle();
assert_equals(getComputedStyle(target).zIndex, '0', 'with inset');
}, 'Dynamically changing view-timeline-inset');
</script>
<template id=timeline_display_none>
<style>
#scroller {
timeline-scope: --t1;
}
#timeline {
view-timeline: --t1;
}
#target {
animation: anim 1s linear;
animation-timeline: --t1;
}
</style>
<div id=scroller class=scroller>
<div></div>
<div id=timeline></div>
<div id=target></div>
</div>
</template>
<script>
promise_test(async (t) => {
inflate(t, timeline_display_none);
await scrollTop(scroller, 50);
assert_equals(getComputedStyle(target).zIndex, '25', 'display:block');
timeline.style.display = 'none';
await waitForNextFrame();
// The timeline became inactive.
assert_equals(getComputedStyle(target).zIndex, '-1', 'display:none');
}, 'Element with scoped view-timeline becoming display:none');
</script>
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