MVC is a descriptive point of view, not a prescriptive implementation plan. It's one of the only software idioms that's actually an Alexanderian Pattern, unlike the vast majority of the GoF that's just reflective of language warts/features.
There are tons of completely different ways you could describe the web as MVC:
Model View Controller
URL Response Request
DB Response Request
Response Hypermedia Sub-Requests
LocalStorage DOM Javascript
data:// JavaScript DOM Events
...