1. Dart
2. dart:html
3. ScreenOrientation
4. onChange property

ScreenOrientation class

1. Properties
2. angle
3. onChange
4. type
5. hashCode
6. on
7. runtimeType
8. Methods
9. lock
10. unlock
11. addEventListener
12. dispatchEvent
13. noSuchMethod
14. removeEventListener
15. toString
16. Operators
17. operator ==
18. Constants
19. changeEvent

Stream<Event> get onChange => changeEvent.forTarget(this);