Look at your markup

Once you've analyzed the structure of your pages, it’s time to take a look under the proverbial hood and analyze your existing markup for presentational HTML that can be replaced with structural markup.

• For the love of all that is pure and good, get rid of <font> tags and spacer GIFs!
• Likewise, lose the <b> and <br> markup.
• Get rid of presentational markup for tables (bgcolor, background, and the like).
• Replace purely presentational CSS coding (things like <span class="header">) with appropriate structural markup. (Tantek Çelik goes into more detail in his post, A Touch of Class.)