This is a good book for getting started with XSS, with comprehensive information about the subject, but with quite a few significant drawbacks:



- There are a lot of spelling errors (almost one per page)

- There's not a straightforward structure of content

- It's very apparent that this has been written separately by many authors: there doesn't seem to be an effort to provide a single, similar and coherent writing style (e.g. in the same chapter, each section has its own little introduction, repeating things already mentioned in previous sections)

- It has had a very poor technical and editorial review (as shown by the many mistakes)

- It contains some strange things that make you wonder about how much thought was put while making the book (e.g. screenshots of full-black webpages)



Given the fact that there aren't many books on the subject, this is one you'd probably want to buy, but be prepared for a lot of mistakes and oversights.