The read-only BroadcastChannel.name property returns a DOMString, which uniquely identifies the given channel with its name. This name is passed to the BroadcastChannel() constructor at creation time and is therefore read-only.
// Connect to a channel
var bc = new BroadcastChannel('test_channel');
// More operations (like postMessage, …)
// Log the channel name to the console
console.log(bc.name); // "test_channel"
// When done, disconnect from the channel