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