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DOMStringList
interface DOMStringList {
    
     [index: number]: string;
     
    
    
readonly length: number;
    
    contains(string: string): boolean;
    
    item(index: number): string | null;
    }
  Index Signatures
      [index: number]: string
     
    Properties
       readonly length: number
      
      Returns the number of strings in strings.
Methods
       contains(string: string): boolean
      
      Returns true if strings contains string, and false otherwise.
       item(index: number): string | null
      
      Returns the string with index index from strings.
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 https://doc.deno.land/deno/stable/~/DOMStringList