Toward a Standard Font Size Interval System
http://style.cleverchimp.com/font_size_intervals/altintervals.html

Fahrner, Todd
Cleverchimp
1999

Abstract:

This document discusses the strengths and weaknesses of various deployed and recommended methods of specifying font sizes in Web documents and application interfaces, and proposes a harmonization. This scheme will enhance the legibility, clarity, and aesthetics of documents presented on screen, and help retire less elegant alternatives that are hurtful to the Web as a dynamic information resource - one that is accessible to users with widely varying needs and purposes. It is intended for Web browser and stylesheet implementors of all religions, but may be of interest to Web authors and digital typography and/or CSS enthusiasts at large.