41 lines
1.3 KiB
HTML
41 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
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<link rel="help" href="https://drafts.csswg.org/css-display-4/#display-animation">
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<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/6429">
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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="/css/css-animations/support/testcommon.js"></script>
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<div id="target">hello</div>
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<style>
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@keyframes display-animation {
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0% { display: none; }
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100% { display: block; }
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}
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#target {
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display: none;
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}
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#target.animate {
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animation: display-animation 1s;
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display: block;
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}
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</style>
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<script>
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promise_test(async (t) => {
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t.add_cleanup(() => target.classList.remove('animate'));
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let numAnimationstartFired = 0;
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target.addEventListener('animationstart', () => numAnimationstartFired++);
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assert_equals(getComputedStyle(target).display, 'none',
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'The display should be none before the animation.');
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await waitForAnimationFrames(1);
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target.classList.add('animate');
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await waitForAnimationFrames(2);
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assert_equals(getComputedStyle(target).display, 'block',
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'The display should be block during the animation.');
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assert_equals(numAnimationstartFired, 1,
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'Only one animation should start.');
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}, 'display:none animating to display:block should be block for the whole animation.');
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</script>
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