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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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                 遥遥无期 
              
              
    
                
                   遥遥无期
                                             
                
                
                (楼主)
            
              
                  
    
                2021-01-02 23:01
              
    

            
    
            
    
              
              

    A one-liner that returns unique class names in alphabetical order, the query part based on @torazaburo's answer:
    


    [].concat(...[...document.querySelectorAll('*')].map(e=>[...e.classList])).filter((d,i,a)=>a.indexOf(d)==i).sort()

    
    
    
             
    
                                                        
    
            
    
            
    
              
                
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