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Showing content from https://webplatform.github.io/docs/apis/web-messaging/MessagePort below:

MessagePort · WebPlatform Docs

Exposes the available methods on the connected ports.

No properties.

close

Disconnects the port, so that it is no longer active.

postMessage

Posts a message through the channel, from one port to the other.

start

Begins dispatching messages received on the port. See Notes.

No events.

Two MessagePort objects are automatically created when a MessageChannel object is created, and are returned by the port1 and port2 properties. Messages are sent from one port are received by the other, and vice versa. The MessagePort object provides the start method to begin dispatching messages received on the port, and the close method to close and disconnect the port. The postMessage method sends messages through the port. In Internet Explorer 10, message ports are automatically enabled when a message event is registered with the onmessage property or addEventListener method. This makes it unnecessary to explicitly call the start method under these conditions. After posting a MessagePort object using postMessage, the MessagePort object is implicitly closed.

W3C Web Messaging Specification

W3C Candidate Recommendation

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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