However , due to the complexity of simulating a formatted-page in a scrolling region , it would probably be many years ( over 5 = 2014 + ) before such , side-by-side , editing could be implemented in a single browser page . However , due to the complexity of simulating a formatted-page in a scrolling region , it would probably be many years ( over 5 = 2016 + ) before such , side-by-side , editing could be implemented in a single browser page .