Created attachment 473748 [details] Reproduction demo Setup: We have a scroll-snap container that we lazily insert new children as needed. The children are absolutely positioned within the container so that they're visually in the correct order. When we append children _after_ the currently visible child, the container's scroll width increases but we maintain our position. But, if we _prepend_ a new child, we see a scroll happen to the newly inserted child. Both Chrome and Firefox maintain the currently visible child, so I think this is a bug with Safari. Steps: 1. [Open demo](https://output.jsbin.com/qudumap/quiet) 2. Notice we're on "Card 10" 3. Click `insertBefore` button to prepend child 4. Notice we've scrolled to "Card 9".