1. Dart
2. dart:html
3. Client
4. postMessage method

Client class

1. Properties
2. frameType
3. id
4. type
5. url
6. hashCode
7. runtimeType
8. Methods
9. postMessage
10. noSuchMethod
11. toString
12. Operators
13. operator ==

void postMessage(Object message, [List<Object> transfer]) native;