Q. I just bought the 18th edition. Do you know where I can find out what typeface the text is set in?
A. If you turn to the very last page of text, following the index, you will see that the print edition of the Manual is composed (or typeset) in Source Serif and Public Sans. Source Serif, which has serifs, is used for most of the text aside from run-in paragraph subheads and certain illustrations. (The statement at the end of the book about design and production is called a colophon; see CMOS 1.76.) To complement the look of the printed book, CMOS Online (including the Q&A!) uses a version of Source Serif designed for the screen.