[antjanus]

I think what we'll see in 5 years will be browsers using even more hardware acceleration/GPU acceleration for its rendering -- so it'll be entirely abstracted away from us. Obviously, direct canvas rendering will still be more performant.

[DevKoala]

I don't think anything will stop browser vendors from advancing the HTML/CSS standards, but I also believe that we will see the emergence of libraries that have a different opinion around layout declarations and core components. These libraries will benefit from browser vendors opening up the GPU with each new iteration.