If a front-end creates a mockup using a certain DOM, it is easy for the back-end to generate that DOM (or tell the front what needs changing). If the back-end g

If a front-end creates a mockup using a certain DOM, it is easy for the back-end to generate that DOM (or tell the front what needs changing). If the back-end generates a DOM, it is typically easy for the front-end to create CSS/Javascript to fit (or tell the back-end what needs changing). Also, learning that (:a :href uri name) maps to <a href=uri>name</a> is not hard, so usually the front-end will be capable of making basic changes. It is not a significant obstacle.