1. Dart
2. dart:html
3. PresentationConnection
4. onMessage property

PresentationConnection class

1. Properties
2. binaryType
3. id
4. onMessage
5. state
6. url
7. hashCode
8. on
9. runtimeType
10. Methods
11. close
12. send
13. terminate
14. addEventListener
15. dispatchEvent
16. noSuchMethod
17. removeEventListener
18. toString
19. Operators
20. operator ==
21. Constants
22. messageEvent

Stream<MessageEvent> get onMessage => messageEvent.forTarget(this);