[jhowell]

My understanding is that if you want to embed a font to be used for the main body of the book, a "Publisher font", you should set that as the font family of the body element and no where else. That allows it to be overridden by the user's selection.

You should not set a font family any place else, except where you want to use a font that you have included in the book for certain specific text, such as fancy headings. Regular paragraphs in the book should not have a font family set.