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

##### CssNamespaceRule class

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

description

# namespaceUri property Null safety

String? namespaceUri
@JSName('namespaceURI')

## Implementation

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