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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /scroll-animations/css/scroll-timeline-nearest-dirty.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>Unrelated style mutation does not affect anonymous timeline</title>
<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>