| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>CSS Transitions Test: no transitionend event after display:none</title> |
| <link rel="author" title="Chris Rebert" href="http://chrisrebert.com"> |
| <link rel="help" href="http://www.w3.org/TR/css3-transitions/#transition-events"> |
| <link rel="help" href="https://lists.w3.org/Archives/Public/www-style/2015Apr/0405.html" title="[CSSWG] Minutes Telecon 2015-04-29" data-section-title="AnimationEnd events and display: none"> |
| <meta name="assert" content="Making an element display:none; while it has a transition in progress should prevent a transitionend event from getting fired."> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="./support/helper.js" type="text/javascript"></script> |
| |
| </head> |
| <body> |
| |
| <div id="log"></div> |
| |
| <script> |
| async_test(t => { |
| window.addEventListener('load', function () { |
| const div = addDiv(t, { 'style': 'transition: background-color 0.4s;' + |
| 'background-color: red' }); |
| getComputedStyle(div).backgroundColor; |
| div.style.backgroundColor = 'blue'; |
| |
| // Wait until the transition has started before registering the event |
| // listener. That way, if the transition finishes before the |
| // requestAnimationFrame callback is called and the element is made |
| // display:none, we won't report an error if transitionend is dispatched. |
| // |
| // In that case, there will be no indication that the test didn't test |
| // anything. However, that's preferable to having this test fail |
| // intermittently on slower automation hardware and end up being disabled |
| // as a result. |
| requestAnimationFrame(t.step_func(() => { |
| div.addEventListener('transitionend', t.step_func(() => { |
| assert_unreached('transitionend event didn\'t fire'); |
| }), false); |
| |
| div.style.display = 'none'; |
| |
| setTimeout(t.done.bind(t), 500); |
| })); |
| }, false); |
| }, 'transitionend should not be fired if the element is made display:none during the transition'); |
| </script> |
| </body> |
| </html> |