display-none-to-display-block-dont-cancel.tentative.html (1374B)
1 <!DOCTYPE html> 2 <link rel="author" title="Tim Nguyen" href="https://github.com/nt1m"> 3 <link rel="help" href="https://drafts.csswg.org/css-display-4/#display-animation"> 4 <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/6429"> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/css/css-animations/support/testcommon.js"></script> 8 9 <div id="target">hello</div> 10 <style> 11 @keyframes display-animation { 12 0% { display: none; } 13 100% { display: block; } 14 } 15 #target { 16 display: none; 17 } 18 #target.animate { 19 animation: display-animation 1s; 20 display: block; 21 } 22 </style> 23 <script> 24 promise_test(async (t) => { 25 t.add_cleanup(() => target.classList.remove('animate')); 26 let numAnimationstartFired = 0; 27 target.addEventListener('animationstart', () => numAnimationstartFired++); 28 29 assert_equals(getComputedStyle(target).display, 'none', 30 'The display should be none before the animation.'); 31 32 await waitForAnimationFrames(1); 33 target.classList.add('animate'); 34 await waitForAnimationFrames(2); 35 36 assert_equals(getComputedStyle(target).display, 'block', 37 'The display should be block during the animation.'); 38 assert_equals(numAnimationstartFired, 1, 39 'Only one animation should start.'); 40 }, 'display:none animating to display:block should be block for the whole animation.'); 41 </script>