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

##### BroadcastChannel class

1. Constructors
2. BroadcastChannel
3. Properties
4. hashCode
5. name
6. on
7. onMessage
8. runtimeType
9. Methods
10. addEventListener
11. close
12. dispatchEvent
13. noSuchMethod
14. postMessage
15. removeEventListener
16. toString
17. Operators
18. operator ==
19. Constants
20. messageEvent

description

# postMessage method Null safety

void postMessage (

1. Object message

)

## Implementation

    void postMessage(Object message) native;