1. Dart
2. dart:html
3. Screen
4. orientation property

Screen class

1. Properties
2. available
3. colorDepth
4. height
5. keepAwake
6. orientation
7. pixelDepth
8. width
9. hashCode
10. runtimeType
11. Methods
12. noSuchMethod
13. toString
14. Operators
15. operator ==

ScreenOrientation get orientation native;