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I was typing the code directly from the book in my text editor and was having some trouble rendering the basic layout.
I didn't know what was wrong so I downloaded the code and used WinMerge to diff with my own code. In doing so I found a typo in my code which was messing everything, but once I fixed it, I also noticed there was another difference :

In the pBook, listing 3.7 the z-index in the .spa-shell-chat class is 1, and in the .spa-shell-modal class is 2, while in the listings_spwajse2e_2013-10-01\ch03\3.3.3\layout.html file, it's the opposite.

I believe the one in the code is the right one, as the modal window should be rendered over the chat.


Diego T.