That would be great. However, the webs standards are bloated as hell. I know you were probably being factitious. However, I think it's a big problem that web standards have gotten so complicated.
The browser would also have to backward compatible, and handle mal-formatted and bloated code written by god who knows. There are features that are the antithesis of privacy and disabling some of the features breaks quite a few sites. Sadly, the web is no longer linked documents, but has full blown apps. It's honestly freaking insane.