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<!DOCTYPE html>
<title>scroll-timeline and container queries</title>
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#scroll-timeline-shorthand">
<link rel="help" src="https://drafts.csswg.org/css-contain-3/#container-queries">
<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>
#outer {
height: 100px;
width: 150px;
}
#container {
container-type: size;
}
#scroller {
overflow: auto;
width: auto;
height: 100px;
}
#scroller > div {
height: 200px;
}
/* This does not apply initially. */
@container (width > 200px) {
#scroller {
scroll-timeline: --timeline;
}
}
@keyframes recolor {
from { background-color: rgb(100, 100, 100); }
to { background-color: rgb(200, 200, 200); }
}
#element {
height: 10px;
width: 10px;
animation: recolor 10s linear;
animation-timeline: --timeline;
background-color: rgb(0, 0, 0);
}
</style>
<div id=outer>
<div id=container>
<div id=scroller>
<div></div>
<div id=element></div>
</div>
</div>
</div>
<script>
setup(assert_implements_animation_timeline);
promise_test(async (t) => {
element.offsetTop;
scroller.scrollTop = (scroller.scrollHeight - scroller.clientHeight) / 2;
await waitForNextFrame();
// Unknown timeline, time held at zero.
assert_equals(getComputedStyle(element).backgroundColor, 'rgb(100, 100, 100)');
// This causes the timeline to be created.
outer.style.width = '250px';
// Check value with getComputedStyle immediately, which is the unanimated
// value since the scroll timeline is inactive before the next frame.
assert_equals(getComputedStyle(element).backgroundColor, 'rgb(0, 0, 0)');
// Also check value after one frame.
await waitForNextFrame();
assert_equals(getComputedStyle(element).backgroundColor, 'rgb(150, 150, 150)');
}, 'Timeline appearing via container queries');
</script>
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