    timeline
        title Timeline of Revolution
        section 17th-20th century
            1.0 : Machinery, Water power, Steam <br>power
            Industry : Electricity : Internal:combustion: engine, Mass production
            Industry 3.0: Electronics, Computers, Automation
        section 21st century
            % node
            section: Internet
            % node
            section : Internet
            % section
            section  : Internet
            % section
            section x: Internet
            % node
            section-4 : Internet
            title-4 : Internet