44 lines
1.4 KiB
HTML
44 lines
1.4 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<title>Transitions start at the same time regardless of on-screen status</title>
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<link rel="help" href="https://drafts.csswg.org/css-animations-2/">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1888748">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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.transition {
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width: 100px;
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height: 100px;
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background-color: blue;
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transition: translate 10000ms linear;
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will-change: translate;
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translate: 0;
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}
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.offscreen {
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background-color: purple;
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translate: -1000px;
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}
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</style>
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<div class="transition"></div>
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<div class="transition offscreen"></div>
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<script>
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'use strict';
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promise_test(async t => {
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let [a, b] = document.querySelectorAll(".transition");
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// Ensure a paint happens to make sure a transition gets triggered (otherwise
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// getAnimations() would flush sync, and maybe not trigger a transition if
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// it's the first style of the elements).
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await new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r)));
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// Trigger both transitions at the same time.
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a.style.translate = b.style.translate = "100px";
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let ta = a.getAnimations()[0];
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let tb = b.getAnimations()[0];
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await Promise.all([ta.ready, tb.ready]);
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assert_equals(ta.startTime, tb.startTime, "Both transitions should've started at the same time");
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});
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</script>
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