prefix property
      
      String
      get
      prefix
      
    
    
The prefix property of the CSSCounterStyleRule interface gets and
sets the value of the  descriptor. If the descriptor does not have a value
set, this attribute returns an empty string.
Implementation
external String get prefix;
      
      set
      prefix
      (String value) 
      
    
    
    
Implementation
external set prefix(String value);