ExtJS has two modes, modern mode is based on sencha touch and uses CSS-based layout, classic mode is based on the older ExtJS rendering model and uses tables fo

ExtJS has two modes, modern mode is based on sencha touch and uses CSS-based layout, classic mode is based on the older ExtJS rendering model and uses tables for layout. You get a richer feature set in classic mode, but the end goal is to achieve parity and then phase it out.