This page lists errata from the book (hopefully not too much!), changes to the specifications since publication, and brand new features.
Opera have announced they’ll release version 11.6 of their browser before 12, and that
repeating-radial-gradient will both be implemented there. I’ve updated the table in Chapter 11 to reflect that.
I’ve also updated the table to show support for repeating gradients in WebKit, which have been present since the beginning of 2011 and were left out in error.
— 5 November, 2011