1. Dart
2. dart:html
3. IntersectionObserver
4. root property

IntersectionObserver class

1. Constructors
2. IntersectionObserver
3. Properties
4. root
5. rootMargin
6. thresholds
7. hashCode
8. runtimeType
9. Methods
10. disconnect
11. observe
12. takeRecords
13. unobserve
14. noSuchMethod
15. toString
16. Operators
17. operator ==

Element get root native;