Most of that navigation stuff is long-solved - e.g. Angular's router will do a lot of that.
If you want to do a SPA without a modern library, then yes you will need to reimplement a bunch of stuff. But who would start from scratch? Unless you are doing something incredibly niche or tiny-tiny-tiny, just use Angular or React or whatever and don't worry about the minutiae.
Of course there will now be people screaming at their screen about how this attitude is everything that is wrong with the modern web etc. I am sure they'll get over it one day, or just go use gopher/Gemini if not.
If you want to do a SPA without a modern library, then yes you will need to reimplement a bunch of stuff. But who would start from scratch? Unless you are doing something incredibly niche or tiny-tiny-tiny, just use Angular or React or whatever and don't worry about the minutiae.
Of course there will now be people screaming at their screen about how this attitude is everything that is wrong with the modern web etc. I am sure they'll get over it one day, or just go use gopher/Gemini if not.