What do square brackets in class names mean?

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清酒与你 2020-12-02 06:41
I saw here square brackets that are used in class names:

      
      
        
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                   一整个雨季
                                             
                
                
                (楼主)
            
              
              
                2020-12-02 07:01
              

            
            
                        
In standard HTML, they have no particular meaning.  It's just more text.

To the jQuery Validation plugin, they do.
    
             
                                                        
            
            
              
                
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