| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>CSS Transitions Test: Transitioning before load event</title> |
| <meta name="assert" content="Test checks that transitions are run even before the load event fires"> |
| <!-- NOTE: This test covers unspecified behavior and should probably be |
| removed. It this behavior *were* specified, it would probably be |
| specified here: --> |
| <link rel="help" title="5. Transition Events" href="https://drafts.csswg.org/css-transitions/#starting"> |
| <link rel="author" title="Rodney Rehm" href="http://rodneyrehm.de/en/"> |
| |
| <script src="/resources/testharness.js" type="text/javascript"></script> |
| <script src="/resources/testharnessreport.js" type="text/javascript"></script> |
| <script src="./support/helper.js" type="text/javascript"></script> |
| |
| </head> |
| <body> |
| |
| <script> |
| // Make sure a transition can run before the load event fires. |
| |
| let loadEventFired = false; |
| window.addEventListener('load', () => { |
| loadEventFired = true; |
| }, false); |
| |
| async_test(t => { |
| const div = addDiv(t, { style: 'transition: height .01s linear; ' + |
| 'height: 1px' }); |
| getComputedStyle(div).height; |
| div.style.height = '100px'; |
| |
| div.addEventListener('transitionrun', t.step_func_done(() => { |
| assert_false( |
| loadEventFired, |
| 'load event should not have fired yet' |
| ); |
| document.getElementById('cat').src = ''; |
| })); |
| }); |
| </script> |
| |
| <img src="support/cat.png?pipe=trickle(d100)" id="cat"> |
| </body> |
| </html> |