1. Dart
2. dart:html
3. DomTokenList
4. supports method

DomTokenList class

1. Properties
2. length
3. value
4. hashCode
5. runtimeType
6. Methods
7. add
8. contains
9. item
10. remove
11. replace
12. supports
13. toggle
14. noSuchMethod
15. toString
16. Operators
17. operator ==

bool supports(String token) native;