I really have my doubts whether this is an appropriate starting point. May be this is more important for those who have been coding only with html for many years. Those who work with wysiwyg programmes may be don´t care about it too much. Nonetheless I think it is useful to mention the difference between the font tag and the css-text style approach at some point in the book.
I am a great fan of “The CSS Anthology” and I would like to buy a book which teaches CSS offering still more information on how to position elements and which includes a practical part about how to design your own WordPress Theme.