90 lines
2.5 KiB
HTML
90 lines
2.5 KiB
HTML
<!DOCTYPE html>
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<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#scroll-timelines">
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<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#avoiding-cycles">
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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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<style>
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@keyframes expand {
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from { width: 100px; }
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to { width: 200px; }
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}
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.scroller {
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overflow: scroll;
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width: 100px;
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height: 100px;
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}
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</style>
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<main id=main></main>
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<script>
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function inflate(t, template) {
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t.add_cleanup(() => main.replaceChildren());
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main.append(template.content.cloneNode(true));
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main.offsetTop;
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}
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</script>
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<template id=basic>
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<style>
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#timeline {
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scroll-timeline: --timeline;
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}
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#element {
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width: 0px;
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animation: expand 10s linear paused;
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animation-timeline: --timeline;
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}
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</style>
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<div id="container">
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<div id=timeline class=scroller><div>
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<div id=element></div>
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</div>
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</template>
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<script>
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promise_test(async (t) => {
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inflate(t, basic);
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await waitForNextFrame();
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assert_equals(getComputedStyle(element).width, '0px');
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}, 'Animation does not apply when the timeline is inactive because there is ' +
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'not scroll range');
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</script>
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<template id=dynamically_change_range>
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<style>
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#contents {
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height: 200px;
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}
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#element {
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width: 0px;
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animation: expand 10s linear paused;
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animation-timeline: --timeline;
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}
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</style>
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<div id="container">
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<div id=element></div>
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</div>
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</template>
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<script>
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promise_test(async (t) => {
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inflate(t, dynamically_change_range);
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await waitForNextFrame();
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let div = document.createElement('div');
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div.setAttribute('class', 'scroller');
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div.style.scrollTimeline = 'timeline';
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div.innerHTML = '<div id=contents></div>';
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try {
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container.insertBefore(div, element);
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// The source has no layout box at the time the scroll timeline is created.
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assert_equals(getComputedStyle(element).width, '0px');
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scroller.offsetTop; // Ensure a layout box for the scroller.
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// Wait for an update to the timeline state:
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await waitForNextFrame();
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// The timeline should now be active, and the animation should apply:
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assert_equals(getComputedStyle(element).width, '100px');
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} finally {
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div.remove();
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}
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}, 'Animation does not apply when timeline is initially inactive');
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</script>
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