CSS Box Model
Marco Casario, Nathalie Wormser, Dan Saltzman, Anselm Bradford, Jonathan Reid, Francesco Improta, Aaron Congleton · Apress eBooks · 2012
When viewing the source HTML code of a page, it’s readily apparent that the content is separated using HTML tags. Paragraphs of text are surrounded by and tags, the main navigational menu is surrounded by and tags, and so forth. The HTML is defining what content is nested inside what other content on the page—it’s defining the content’s structure. It’s like a rough sketch of the layout of a house, which shows what rooms go where but doesn’t indicate their exact dimensions, color, or other properties of their appearance. The task of describing the appearance of a web page is left to the domain of CSS. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.