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<!DOCTYPE html>
<link rel="help" src="https://github.com/w3c/csswg-drafts/pull/5666">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
main {
overflow: hidden;
height: 0px;
scroll-timeline-attachment: defer;
scroll-timeline-name: timeline1, timeline2, timeline3;
}
.scroller {
overflow: hidden;
width: 100px;
height: 100px;
scroll-timeline-attachment: ancestor;
}
.scroller > div {
height: 200px;
}
@keyframes expand {
from { width: 100px; }
to { width: 200px; }
}
#scroller1 {
scroll-timeline-name: timeline1;
}
#scroller2 {
scroll-timeline-name: timeline2;
}
#scroller3 {
scroll-timeline-name: timeline3;
}
#element {
width: 0px;
height: 20px;
animation-name: expand;
animation-duration: 1000s;
animation-timing-function: linear;
animation-timeline: timeline1;
}
/* Ensure stable expectations if feature is not supported */
@supports not (animation-timeline:foo) {
#element { animation-play-state: paused; }
}
</style>
<main>
<div class=scroller id=scroller1><div></div></div>
<div class=scroller id=scroller2><div></div></div>
<div class=scroller id=scroller3><div></div></div>
<div class=scroller id=scroller4><div></div></div>
<div id=container></div>
</main>
<script>
// Force layout of scrollers.
scroller1.offsetTop;
scroller2.offsetTop;
scroller3.offsetTop;
scroller4.offsetTop;
scroller1.scrollTop = 20;
scroller2.scrollTop = 40;
scroller3.scrollTop = 60;
scroller4.scrollTop = 80;
// Create #element in #container, run |func|, then clean up afterwards.
function test_animation_timeline(func, description) {
promise_test(async () => {
try {
let element = document.createElement('element');
element.setAttribute('id', 'element');
container.append(element);
await func();
} finally {
while (container.firstChild)
container.firstChild.remove();
}
}, description);
}
test_animation_timeline(async () => {
await waitForNextFrame();
assert_equals(getComputedStyle(element).width, '120px');
element.style = 'animation-timeline:timeline2';
assert_equals(getComputedStyle(element).width, '140px');
}, 'Changing animation-timeline changes the timeline (sanity check)');
test_animation_timeline(async () => {
await waitForNextFrame();
assert_equals(getComputedStyle(element).width, '120px');
// Set a (non-CSS) ScrollTimeline on the CSSAnimation.
let timeline4 = new ScrollTimeline({
source: scroller4,
scrollOffsets: [CSS.px(0), CSS.px(100)]
});
element.getAnimations()[0].timeline = timeline4;
assert_equals(getComputedStyle(element).width, '180px');
// Changing the animation-timeline property should have no effect.
element.style = 'animation-timeline:timeline2';
assert_equals(getComputedStyle(element).width, '180px');
}, 'animation-timeline ignored after setting timeline with JS (ScrollTimeline from JS)');
test_animation_timeline(async () => {
await waitForNextFrame();
assert_equals(getComputedStyle(element).width, '120px');
let animation = element.getAnimations()[0];
let timeline1 = animation.timeline;
element.style = 'animation-timeline:timeline2';
assert_equals(getComputedStyle(element).width, '140px');
animation.timeline = timeline1;
assert_equals(getComputedStyle(element).width, '120px');
// Should have no effect.
element.style = 'animation-timeline:timeline3';
assert_equals(getComputedStyle(element).width, '120px');
}, 'animation-timeline ignored after setting timeline with JS (ScrollTimeline from CSS)');
test_animation_timeline(async () => {
await waitForNextFrame();
assert_equals(getComputedStyle(element).width, '120px');
element.getAnimations()[0].timeline = document.timeline;
// (The animation continues from where the previous timeline left it).
assert_equals(getComputedStyle(element).width, '120px');
// Changing the animation-timeline property should have no effect.
element.style = 'animation-timeline:timeline2';
assert_equals(getComputedStyle(element).width, '120px');
}, 'animation-timeline ignored after setting timeline with JS (document timeline)');
test_animation_timeline(async () => {
await waitForNextFrame();
assert_equals(getComputedStyle(element).width, '120px');
element.getAnimations()[0].timeline = null;
assert_equals(getComputedStyle(element).width, '120px');
// Changing the animation-timeline property should have no effect.
element.style = 'animation-timeline:timeline2';
assert_equals(getComputedStyle(element).width, '120px');
}, 'animation-timeline ignored after setting timeline with JS (null)');
</script>
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