Like in the past, hopefully browser authors and working groups take what is being done in JavaScript frameworks, and makes those tasks easier to implement and platform/browser agnostic.

It is work like this that is the direct reason that web developers today are able to fantastic things in CSS instead of retarded amounts of JavaScript animation and UI programming.

I doubt many of today's developers truly appreciate how amazingly easy it is do stuff like this now:

  A:hover {color:orange}