1. Dart
2. dart:html
3. CssVariableReferenceValue
4. fallback property

CssVariableReferenceValue class

1. Properties
2. fallback
3. variable
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==

CssUnparsedValue get fallback native;