The document discusses Edward Tufte's principles of information design and their application to web design. It outlines five of Tufte's principles: 1) Graphics reveal data 2) Add detail to clarify 3) Use small multiples to invite comparisons 4) Employ the "smallest effective difference" 5) Above all else, show the data. It then explains how each of these principles can be applied to web design, providing examples and quotes from other designers.