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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/MessagePort/close below:

MessagePort: close() method - Web APIs

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Note: This feature is available in Web Workers.

The close() method of the MessagePort interface disconnects the port, so it is no longer active. This stops the flow of messages to that port.

None.

None (undefined).

In the following code block, you can see a handleMessage handler function, run when a message is sent back to this document using EventTarget.addEventListener.

channel.port1.addEventListener("message", handleMessage, false);
function handleMessage(e) {
  para.innerHTML = e.data;
  textInput.value = "";
}

channel.port1.start();

You could stop messages being sent at any time using

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