The document discusses key principles of web design including unity, variety, balance, scale and proportion, rhythm, emphasis, and simplicity. Unity is achieved through articles of the same size close together. Variety comes from different sized pictures and multiple colors. Balance is created with a main article and sidebars on either side. Scale and proportion are demonstrated through a mountain in the background being smaller than the foreground as well as a hand larger than a head. Rhythm is shown through lines moving with shoes. Emphasis is placed through a featured video being bigger than others. Simplicity is achieved through a simple search engine and article layout.