Yes, in layers. The problem currently is that if you want to tweak something you have to basically replicate the entire stack. That sucks - see Yehuda's artic

Yes, in layers. The problem currently is that if you want to tweak something you have to basically replicate the entire stack. That sucks - see Yehuda's article linked elsewhere in the comments for better examples. ps, if you want to play with jquery-like selector plugins to prollyfill a proposed feature, check out hitchjs.com