Simon Willison’s Weblog

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8th June 2025

Tool Multi-Tab Sync Chat — Send chat messages that synchronize instantly across multiple browser tabs using the Broadcast Channel API. Each tab displays messages sent from other tabs with a sync indicator, allowing real-time communication without requiring a backend server. Open multiple tabs of this page to see messages propagate automatically across all instances.
Posted 8th June 2025 at 3:46 pm

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