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486ff2a564
topic-navigation and topic-map appear in the DOM before the post stream, and are then rearranged with CSS grid. That means that, if they are entirely within the viewport, and does not have a fixed/sticky position, then they will be chosen as the browser's scroll anchor point. We never want these elements to be used as the anchor, so we can set `overflow-anchor: none`. https://meta.discourse.org/t/344386/16