...If the user's browser doesn't have the required features, smoothState.js fades into the background and never runs. Imagine, for a second, how disorienting it would be if touching a doorknob teleported you to the other side of the door. Navigating the web feels like using a teleporting doorknob. Layouts change, elements rearrange or disappear, and it takes time for the user to adjust. Smooth transitions reduce the effort it takes for users to get settled into a new environment. Javascript SPA frameworks, sometimes referred to as MVC frameworks, are a common way to solve this issue. ...