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Safari discards a scrollTop write made while an inner scroller is rubber-banding past its top edge and animates back to 0. In a chat that loads history when the user reaches the top, a prepend landing during the bounce loses its anchor write and the reader ends up a whole prepend away from their row (TanStack#1287). Suppressing the bounce with `overscroll-behavior: none` closes that window; verified in Safari 18.4. Adds it to the chat guide's production checklist next to `overflow-anchor: none`, which the react chat example already set but the guide did not mention, and applies it to the example's scroller. Refs TanStack#1287 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Safari discards a
scrollTopwrite made while an inner scroller is rubber-banding past its top edge and animates back to 0. In a chat that loads history when the user reaches the top, a prepend landing during the bounce loses its anchor write and the reader ends up a whole prepend away from their row (#1287).overscroll-behavior: nonesuppresses the bounce and closes that window. Verified in Safari 18.4 with a trackpad: the rubber band is gone and prepends anchor as expected.🎯 Changes
overflow-anchor: none(the react chat example already set it, the guide did not mention it) andoverscroll-behavior: nonewith the Safari rationale.overscroll-behavior: noneon.Messages.Refs #1287
✅ Checklist
pnpm run test:pr.🚀 Release Impact
🤖 Generated with Claude Code
Summary by CodeRabbit
Bug Fixes
Documentation