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Including stuff that is not part of the specification can cause problems if someone tries to read the book in something other than an ibook. You could have extra blank spaces in the text, valid commands surrounding it that are ignored or other odd thing when you put in commands not part of the spec.
If it will always stay on ibooks, you can get away with it....until your boss tells you to make it accessible to a different device and you get to redo the whole thing!
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