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                            HTMl5不基于SGML,因此不需要對DTD進行引用，但是需要doctype來規范瀏覽器的行為(讓瀏覽器按照它們應該的方式來運行)；而HTMl4.01基于SGMA，所以需要對DTD進行引用，才能告知瀏覽器文檔所使用的文檔類型。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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