|
base font size sets the most common font size used in the book to the specified size and then rescales all other font sizes based on that. So if in your book the most common font size is 0.2345em and the headings are in 0.8em if you set the base font size to 12pt then the 0.2345em font size will become 12pt and the headings font size will become 12 * 0.8/0.2345 (the algorithm is more complicated than that, but thats the basic idea).
So you will end up with the most common font size being set by that setting and all other font sizes being proprotionately scaled.
|