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Every time the AI streams a reply, the whole thread jumps around." ) .sleep(1000) .assistant( "That's the classic streaming scroll problem. Wrap your message list in `MessageScroller` and turn on `autoScroll` — the viewport pins to the bottom as tokens arrive, so users always see the latest text land in place.\n\nThe important part: it only auto-scrolls while the reader is already at the bottom. The moment they scroll up to read something earlier, auto-scroll backs off and their position is preserved. You get smooth streaming without fighting the user's intent." ) .user( "Okay, but when someone sends a new message the view still feels jarring — like the whole conversation reloads from the top." ) .sleep(1000) .assistant( "MessageScrollerItem fixes that with turn anchoring. Set `scrollAnchor` on the turn that should settle near the top instead of blindly snapping to the document bottom.\n\nIt also leaves a small peek of the previous exchange visible above the anchor, so context isn't lost. The reply starts in view without that disorienting jump you get from a plain overflow container." ) .user( "And if they've scrolled up to re-read an older answer? I don't want to yank them back down." ) .sleep(1000) .assistant( "You won't. Auto-scroll only runs when the viewport is already pinned to the bottom, so scrolling up is a deliberate opt-out — their place in the thread stays put even as new tokens keep arriving below.\n\nWhen there is content they haven't seen yet, `MessageScrollerButton` appears at the bottom of the viewport. One tap jumps them back to the newest message and re-engages auto-scroll. Same pattern as Slack or iMessage: quiet when you're caught up, helpful when you're not." ) .user("Last one — does this work with assistive tech?") .sleep(1000) .assistant( '`MessageScrollerContent` sets `role="log"` and `aria-relevant="additions"` by default, so screen readers announce new messages as they stream in.\n\nThe scroll button is a real ` } />

Reset

{messages.map((message) => { const normalized = { id: (message as any).id, role: (message as any).role, text: getMessageText(message as any), parts: (message as any).parts, } return ( ) })}

{ e.preventDefault() if (!nextMessage || isBusy) { return } void sendMessage(nextMessage) }} className="w-full" >

{nextMessage ? ( getMessageText(nextMessage) ) : ( No messages queued. Reset the context. )}

} /> Add Photos & Files Create Image Deep Research Web Search

{peek}px { const nextValue = Array.isArray(value) ? value[0] : value setPeek(nextValue ?? DEFAULT_PEEK) }} />

Send

Adjust the slider and send. Observe the previous message peek.

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Message Scroller Context Visible

Installation

Files

@components

Styles