Responsive Ebook Design

The missing component in all three philosophies is a focus on responsive design: the methodology that web developers and designers began cultivating at the advent of the smartphone era to facilitate creation of a universal set of web assets that yield high-quality results optimized for all devices. There’s no reason publishers shouldn’t strive to achieve these same goals, to commit to an analogous philosophy of responsive ebook design.

Sanders Kleinfeld, Responsive Ebook Design: A Primer