https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API
Broadcast Channel API - Web APIs | MDN
The Broadcast Channel API allows basic communication between browsing contexts (that is, windows, tabs, frames, or iframes) and workers on the same origin.
broadcast channel apiweb apismdn
https://www.bennadel.com/blog/4869-cross-document-communication-with-the-broadcast-channel-api-in-javascript.htm
Cross-Document Communication With The Broadcast Channel API In JavaScript
Jan 29, 2026 - Ben Nadel explores the BroadcastChannel() API for publishing messages across browser tabs in JavaScript.
broadcast channel apiwith thecrossdocumentcommunication