Been wanting something like this for a long time.
Some might say it's a nasty hack, but in certain situations I can see this totally coming in handy. I work on a product regularly that needs to facilitate complex communication between remote web view content and local native code, and boy, I really wish I'd known about this library back when I started that project.
GAViewStyling which is a neat little library letting you style
UIView objects with
CSS style declarations.