Single Page Apps

Single Page Apps (SPAs) are the Future of the Web

If your website has a login, has any dynamically generated web pages, or otherwise has a non-trivial amount of code, you are writing an app, not a collection of documents. HTML is an flying-submarine. I.e, it's trying to do two things at the same time which are fundamentally different: be a document format and an app framework. It is impossible to do both those things well at the same time.