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+<!DOCTYPE html>
+<title>Unrelated style mutation does not affect anonymous timeline (root)</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; }
+ }
+ #element {
+ animation: anim forwards;
+ animation-timeline: scroll(root);
+ }
+ #spacer {
+ height: 200vh;
+ }
+</style>
+<div id=element></div>
+<div id=spacer></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>