1. DomName('Window.postMessage')
  2. DocsEditable()
void postMessage(Object message, String targetOrigin, [ List<MessagePort> transfer ])

Sends a cross-origin message.

Other resources

Source 

@DomName('Window.postMessage')
@DocsEditable()
void postMessage(Object message, String targetOrigin, [List<MessagePort> transfer]) => _blink.BlinkWindow.instance.postMessage_Callback_3_(this, convertDartToNative_SerializedScriptValue(message), targetOrigin, transfer);