Webkit is the framework that Apple uses to allow developers to
include webviews in their apps. UIWebview, a UIKit class, provides
a simple way to do so. Both of these are missing from tvOS.
Even though the classes exist to fetch a page from a remote site,
nothing else is really there — the content has to be parsed, the
DOM has to be built, the actual HTML has to be rendered and
mechanism for doing any of these things or presenting the Web page
to the users. […]
No matter what the motivation, there’s going to be a lot of work
for people to do, particularly for companies that lean heavily on
embedded Web content for their apps. Obviously this is going to be
great for users, in terms of a consistent experience.
But the industry is going to be very, very busy for a while making
the changes needed to support this new platform.