This document discusses key web design principles:
Unity focuses on visual similarity, proximity, and alignment of elements. Variety adds interest through different elements without being overwhelming. Balance distributes weight symmetrically or asymmetrically. Scale and proportion deal with size comparisons and relative sizing of elements. Rhythm creates movement between parts. Emphasis isolates, places, or contrasts elements for prominence. Simplicity omits non-essential elements for clarity. Examples are given for how websites like Facebook, Pinterest, and Google employ these principles.