1. Dart
2. dart:html
3. CssNamespaceRule
4. namespaceUri property

CssNamespaceRule class

1. Properties
2. namespaceUri
3. prefix
4. cssText
5. hashCode
6. parentRule
7. parentStyleSheet
8. runtimeType
9. type
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==

@JSName('namespaceURI')
String get namespaceUri native;