Ben Nadel • 1/29/2026

Cross-Document Communication With The Broadcast Channel API In JavaScript

This technical article explains the Broadcast Channel API in JavaScript, a modern web platform feature for publish/subscribe messaging between browser tabs/windows on the same origin. It contrasts the API with the older window.postMessage() method, highlighting its security and ease-of-use benefits, and includes a practical laser pointer demo using iframes to illustrate real-time coordinate sharing.

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#JavaScript #Web API #Pubsub