events-007.html (2098B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>CSS Transitions Test: no transitionend event after display:none</title> 6 <link rel="author" title="Chris Rebert" href="http://chrisrebert.com"> 7 <link rel="help" href="http://www.w3.org/TR/css3-transitions/#transition-events"> 8 <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"> 9 <meta name="assert" content="Making an element display:none; while it has a transition in progress should prevent a transitionend event from getting fired."> 10 11 <script src="/resources/testharness.js"></script> 12 <script src="/resources/testharnessreport.js"></script> 13 <script src="./support/helper.js" type="text/javascript"></script> 14 15 </head> 16 <body> 17 18 <div id="log"></div> 19 20 <script> 21 async_test(t => { 22 window.addEventListener('load', function () { 23 const div = addDiv(t, { 'style': 'transition: background-color 0.4s;' + 24 'background-color: red' }); 25 getComputedStyle(div).backgroundColor; 26 div.style.backgroundColor = 'blue'; 27 28 // Wait until the transition has started before registering the event 29 // listener. That way, if the transition finishes before the 30 // requestAnimationFrame callback is called and the element is made 31 // display:none, we won't report an error if transitionend is dispatched. 32 // 33 // In that case, there will be no indication that the test didn't test 34 // anything. However, that's preferable to having this test fail 35 // intermittently on slower automation hardware and end up being disabled 36 // as a result. 37 requestAnimationFrame(t.step_func(() => { 38 div.addEventListener('transitionend', t.step_func(() => { 39 assert_unreached('transitionend event didn\'t fire'); 40 }), false); 41 42 div.style.display = 'none'; 43 44 setTimeout(t.done.bind(t), 500); 45 })); 46 }, false); 47 }, 'transitionend should not be fired if the element is made display:none during the transition'); 48 </script> 49 </body> 50 </html>