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Finding all class names used in HTML/DOM

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耶瑟儿～
耶瑟儿～ 2021-01-02 22:05

How can I get a list of all class names used inside an HTML Snippet?

For example, the HTML Snippet below,


  


        

      

      
      

        

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                 梦毁少年i 
              
              
    
                
                   梦毁少年i
                                             
                
                
                (楼主)
            
              
                  
    
                2021-01-02 23:02
              
    

            
    
            
    
              
              

    Get all the classes & the unique ones in one dimension.
    

    const allClasses = Array.from(new Set(document.querySelectorAll("*").map(el => el.classNames)));

const flatClasses = Array.from(new Set(allClasses.flat(1)))

    
    
    
             
    
                                                        
    
            
    
            
    
              
                
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