How Can I Communicate Between Browser Tabs or Windows Securely and Tracelessly?

Communication between Tabs or Windows without Leaving Traces

When seeking solutions for communicating between multiple tabs or windows within the same browser domain without leaving remnants, several proposed approaches include:

• Window Object: Creating a new window from the current one, but this method is susceptible to communication loss upon window reloading.
• PostMessage: Allows for cross-origin communication but faces the same issue as using the window object, requiring persistent window objects.
• Cookies: While effectively sending messages to all windows on the same domain, cookies face readability uncertainties and length limitations of 4 KB.
• LocalStorage: Overcomes cookie limitations, offers event listeners, but lacks direct send and listen functionality.

A modern API specifically tailored to this purpose is Broadcast Channel. Its implementation is straightforward:

var bc = new BroadcastChannel('test_channel');

bc.postMessage('This is a test message.'); // Send
bc.onmessage = function (ev) { console.log(ev); } // Receive

Broadcast Channel supports data serialization using the structured clone algorithm, allowing for the safe transmission of diverse data objects. It is widely supported by browsers, with a polyfill available for added compatibility.

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