| <!doctype html> |
| <html> |
| <head> |
| <meta charset=utf-8> |
| <title>CSS Transitions Test: 0-duration transition with delay applies after delay</title> |
| <meta name="assert" content="Transition with 0s duration and 0.3s delay applies property change after delay period"> |
| <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 0.1s; width: 0px;' |
| }); |
| |
| // Flush initial state |
| getComputedStyle(div).width; |
| // First transition to 100px |
| div.style.width = '100px'; |
| await waitForTransitionEnd(div); |
| |
| // Change transition to 0s duration with 300ms delay |
| div.style.transition = 'width 0s linear 0.3s'; |
| |
| // Set width back to 0 |
| div.style.width = '0px'; |
| // Immediate check - should NOT have changed yet |
| const computedStart = getComputedStyle(div).width; |
| assert_equals( |
| computedStart, |
| '100px', |
| 'Width should remain at 100px initially' |
| ); |
| // Wait for transitionend (should trigger after 300ms delay) |
| await waitForTransitionEnd(div); |
| |
| // Verify final state |
| const finalWidth = getComputedStyle(div).width; |
| |
| assert_equals( |
| finalWidth, |
| '0px', |
| 'Width should reset to 0 after delay' |
| ); |
| |
| }, '0-duration transition with delay applies change after delay period'); |
| </script> |
| |
| </body> |
| </html> |
