CSS and Semantic Markup

Why Your Site Should be Developed with CSS and Semantic Markup
By James Kendall

Why your site should be developed with CSS and semantic markup

One thing that I have learned in over a decade developing web sites is that the Net is continually changing, and to keep up you need to change with it. One of the more recent developments in web design is the use of CSS and semantic markup. CSS and semantic web design has several benefits: clarity in code, browser and other web-enabled devices compatibility, seperation of content and presentation, smaller burden on bandwith, and better visibility to search engines.

Back in the day, we designed sites with tables and hacked those tables into doing things that they were never meant to do. The table tag was designed to display tabular data, not as a way to render the layout of a website. Unfortunately, a better alternative did not exist, so we used tables. This made for inefficient, slow loading sites with code that was very hard to read and maintain. Wikipedia defines sematic markup like this:

Sematic pages: supply information for Web search engines using web crawlers. This could be machine-readable information about the human-readable content of the document (such as the creator, title, description, etc., of the document) or it could be purely metadata representing a set of facts (such as resources and services elsewhere in the site). (Note that anything that can be identified with a Uniform Resource Identifier (URI) can be described, so the semantic web can reason about people, places, ideas, cats etc.)