"HTML5 For Web Designers" by Jeremy Keith was the first book published by A Book Apart and does a good job at setting the tone for this series of useful books from the folks behind A List Apart. Jeremy does a good job at touching on key information such as obsolete tags, accessibility concerns, f...
I've read most of this book, and can comment that a) the content is very accessible to non-programmers, though b) knowing something about markup languages in general and the state of the world prior to HTML5 would be helpful c) the content is largely about reassuring web designers that HTML5 is o...