1. Dart
2. dart:html
3. CssGroupingRule
4. insertRule method

##### CssGroupingRule class

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

description

# insertRule method Null safety

int insertRule (

1. String rule,
2. int index

)

## Implementation

    int insertRule(String rule, int index) native;