That's a category error. JS is a programming language. All the bells and whistles you mention are part of Web platform machinery with APIs through JS-level bi

That's a category error. JS is a programming language. All the bells and whistles you mention are part of Web platform machinery with APIs through JS-level bindings accessible to programs written by website authors. The language/dialect has little to do with it; you're envisioning a different stack that would require a new browser engine, not a language.