The Modern Web - Multi-Device Web Development with HTML5, CSS3, and Javascript by Peter Gasston
This book is excellent in every sense – scope, depth, readability…
It is an excellent survey for anyone who does not closely track the development of all the web app related technologies. It is broad and accurate enough for someone to make a decision regarding the strategy for future web app development, and has sufficient depth to get him started on the path to develop a new app. Apparently it cannot be used as a reference of any specific technology for anyone to reply on for developing apps. It would require an order of magnitude larger volume to cover every surveyed technology in details.