1. Dart
2. dart:html
3. MutationEvent
4. ADDITION constant

MutationEvent class

1. Properties
2. attrChange
3. attrName
4. newValue
5. prevValue
6. relatedNode
7. bubbles
8. cancelable
9. composed
10. currentTarget
11. defaultPrevented
12. eventPhase
13. hashCode
14. isTrusted
15. matchingTarget
16. path
17. runtimeType
18. target
19. timeStamp
20. type
21. Methods
22. initMutationEvent
23. composedPath
24. noSuchMethod
25. preventDefault
26. stopImmediatePropagation
27. stopPropagation
28. toString
29. Operators
30. operator ==
31. Constants
32. ADDITION
33. MODIFICATION
34. REMOVAL

static const int ADDITION = 2