This is an work-in-progress Ember Engine that lets you mount an existing server-rendered website inside an Ember application and begin enhancing it with Ember-defined behaviors.
Much like pjax, TurboLinks, or refreshless, it inverts the normal control of web page loading and fetches HTML via the fetch API. This can be good for performance. But more importantly, it creates a graceful upgrade path for enhancing an existing website with advanced user experienced that are only possible when you have a robust in-browser application.