Literally everything is javascript. The servers run server side javascript to hand you a pile of javascript.
Javascript is code, it can do weird shit and you just let it happen and run whatever code the website says to. This is weird and bad but ok.
It doesn't care about design paradigms or accessability. It just constantly blasts my soundcloud for no good reason and doesn't really have any meaningful content cause I haven’t written any yet. Maybe someday I'll get to edit that last part out but that seems unlikely