Interestingly, if there's more than one scroll timeline of the same name under the scope, it's treated as if no scroll timeline is found, as per [spec](https://drafts.csswg.org/scroll-animations-1/#timeline-scope). > If no such timeline exists, or if more than one such timeline exists, instead declares an inactive timeline with the specified name.
Bug 1774060 Comment 9 Edit History
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Interestingly, if there's more than one scroll timeline of the same name under the scope, it's treated as if no scroll timeline is found, as per [spec](https://drafts.csswg.org/scroll-animations-1/#timeline-scope). > If no such timeline exists, or if more than one such timeline exists, instead declares an inactive timeline with the specified name. i.e. Modifying the testcase above to set `.st` on the first scroller causes `.anim` to stop animating.