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When the rubberband effect causes Safari to scroll past the top of the page, the value of scrollTop becomes negative. If the offset of the first ScrollSpy target is 0 - essentially if the target is at the top of the page - then ScrollSpy should not clear the active item. Conceptually, the first item should remain active when rubberbanding past the top of the page. This commit fixes issue #21055 by verifying the first scrollspy target is not at the top of the page before clearing the active nav-item.