| <!doctype html> |
| <html> |
| <head> |
| <meta charset=utf-8> |
| <title>CSS Transitions Test: Removing transition and changing width applies change immediately</title> |
| <meta name="assert" content="When a transition is removed and a width is changed after a previous transition completes, the change is immediate."> |
| <link rel="help" href="https://drafts.csswg.org/css-transitions/#starting"> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="./support/helper.js"></script> |
| |
| </head> |
| <body> |
| <div id="log"></div> |
| |
| <script> |
| promise_test(async t => { |
| const div = addDiv(t, { |
| style: 'transition: width 0.02s; width: 0px;' |
| }); |
| |
| // Flush initial state |
| getComputedStyle(div).width; |
| div.style.width = '100px'; |
| |
| // Wait for transition to complete |
| await waitForTransitionEnd(div); |
| |
| // Verify the width after first transition |
| const afterFirst = getComputedStyle(div).width; |
| assert_equals(afterFirst, '100px', 'width should be 100px after first transition'); |
| |
| // Set width back to 0 and remove transition |
| div.style.width = '0px'; |
| div.style.transition = ''; |
| |
| // Force layout update to ensure style computation |
| const afterSecond = getComputedStyle(div).width; |
| // Check width is immediately updated |
| assert_equals( |
| afterSecond, |
| '0px', |
| 'width should reset to 0 immediately' |
| ); |
| |
| }, 'Removing transition and changing width applies change immediately'); |
| </script> |
| |
| </body> |
| </html> |
