| <!DOCTYPE html> |
| <title>Unrelated style mutation does not affect anonymous timeline</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-notation"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/scroll-animations/scroll-timelines/testcommon.js"></script> |
| <script src="/css/css-animations/support/testcommon.js"></script> |
| <script src="support/testcommon.js"></script> |
| <style> |
| @keyframes anim { |
| from { z-index: 100; } |
| to { z-index: 100; } |
| } |
| #scroller { |
| overflow: auto; |
| width: 100px; |
| height: 100px; |
| } |
| #element { |
| animation: anim forwards; |
| animation-timeline: scroll(); |
| } |
| #spacer { |
| height: 200px; |
| } |
| </style> |
| <div id=scroller> |
| <div id=element></div> |
| <div id=spacer></div> |
| </div> |
| |
| <script> |
| setup(assert_implements_animation_timeline); |
| |
| promise_test(async () => { |
| await waitForCSSScrollTimelineStyle(); |
| assert_equals(getComputedStyle(element).zIndex, '100'); |
| // Unrelated style mutation does not change the effect value: |
| element.style.color = 'green'; |
| assert_equals(getComputedStyle(element).zIndex, '100'); |
| }); |
| </script> |
