Appending div tag before all `block`


        
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              没有蜡笔的小新
                          
            
            2020-12-13 09:20
          
                    
                                 
        
                      
         


         
                    
I am trying to insert a div tag before all existing code tag on my page when load.
I have searched and I found some techniques to append div before a div, specificing ID, bu         


        
                      
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Appending div tag before all block

Appending div tag before all `block`