| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>CSS Transitions: behavior when a shadow root is inserted while transitioning</title> |
| <meta name="assert" content="Checks the addition of a shadow root does not affect an in-flight transition"> |
| <link rel="help" href="https://drafts.csswg.org/css-transitions/"> |
| |
| <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> |
| <div id="log"></div> |
| <script> |
| test(t => { |
| // Start a 100s transition 50% of the way through |
| const div = addDiv(t, { |
| style: 'transition: height 100s -50s linear; height: 0px', |
| }); |
| getComputedStyle(div).height; |
| div.style.height = '100px'; |
| assert_equals( |
| getComputedStyle(div).height, |
| '50px', |
| 'Transition should be initially 50% complete' |
| ); |
| |
| // Add a shadow root |
| div.attachShadow({ mode: "open" }); |
| |
| // The transition on the height property should not have been canceled |
| assert_equals( |
| getComputedStyle(div).height, |
| '50px', |
| 'Transition should not have been canceled' |
| ); |
| }, 'addition of a shadow root should not cancel in-flight transitions'); |
| </script> |
| |
| </body> |
| </html> |
