A practical guide to sharing data and coordinating work across browser threads — tabs, workers, and shared memory.
3 articles in this series
The BroadcastChannel API lets you send messages between browser tabs, windows, and iframes on the same origin. Learn how it works, when to use it, and how it compares to postMessage.
Transferable Objects let you move ArrayBuffers, ImageBitmaps, and other large data between Web Workers and windows without copying. Learn how they work and when to use them with postMessage and BroadcastChannel.
SharedArrayBuffer lets multiple Web Workers read and write the same memory simultaneously. Atomics makes that safe by preventing race conditions. Learn how they work, when to use them, and how to enable them with COOP/COEP headers.