The book is intended to be general; from the introduction: The ty­po­graph­ic rules in this book aren’t specific to par­tic­u­lar soft­ware. You can ap­ply thes

The book is intended to be general; from the introduction: The ty­po­graph­ic rules in this book aren’t specific to par­tic­u­lar soft­ware. You can ap­ply these rules in just about any mod­ern page-lay­out pro­gram or word proces­sor. To emphasise what I said above: the book is passing off a didactic point about authoring (yes, many newspapers and publishers want their journalists and authors to follow the one-space rule in their copy) into a simplistic rule of typography, one which happens to be meaningless in many contexts and is based on fallacious reasoning.