1. Dart
2. dart:html
3. Console
4. groupEnd method

Console class

1. Properties
2. hashCode
3. memory
4. runtimeType
5. Methods
6. assertCondition
7. clear
8. count
9. countReset
10. debug
11. dir
12. dirxml
13. error
14. group
15. groupCollapsed
16. groupEnd
17. info
18. log
19. markTimeline
20. noSuchMethod
21. profile
22. profileEnd
23. table
24. time
25. timeEnd
26. timeLog
27. timeStamp
28. toString
29. trace
30. warn
31. Operators
32. operator ==

void groupEnd() =>
    _isConsoleDefined ? JS('void', 'window.console.groupEnd()') : null;