In the model I was referring to, the browser doesn't go away. Only the built-in web does. Replaced by a more general virtual machine with reasonably low level a

In the model I was referring to, the browser doesn't go away. Only the built-in web does. Replaced by a more general virtual machine with reasonably low level access to the underlying system. We are, more and more, treating the web this way anyway. It is becoming a pointless abstraction. There is no particular reason for HTML, CSS, etc. to be built-in components, but that does not mean the web has to go away completely. If your network location wants to load an HTML document, you can command the browser to fetch an HTML renderer over the network. But you can just as easily serve an application of another kind, depending on your desires and needs.