We all have enjoyed reading the Head First series of books and this book i.e Head First HTML5 Programming is no different. The authors Eric Freeman and Elisabeth Robson have kept the content in the book as much practical as possible which means that your are more of coding than reading. Not all the features of HTML 5 have been covered and the few which were not covered, the authors have mentioned them in the Appendices. But the authors have covered quite a few important and tough to understand features.
The examples explaning the video and web worker features have used complicated examples which might pose some problems for few but then those examples show the power of those features.
I would recommend anyone who wants to explore HTML5 to pick this book and not get turned off by the number of pages.