Separating Appearance from Structure
Separating appearance from structure is a key concept in CSS. The basic idea is that HTML should be responsible for specifying the structural elements of a document (headings, paragraphs, lists, hypertext links, and so on), while CSS should be responsible for specifying the appearance of those elements. Both HTML 4 and XHTML are formulated to facilitate this division of labor. There are some important reasons for separating appearance from structure in HTML documents:
It facilitates visually richer presentations while conserving bandwidth, in that a style need only be stated once for an element and the same style sheet can be used for all the pages within a site. Web designers need no longer rely on using ...
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