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