Font Sizes and accessibility: To facilitate accessibility, experts recommend relative font sizes ("small," "big," "bigger," for example) instead of absolute point sizes. Use of HTML heading tags such as <H1> and <H2> also helps text reading devices to interpret the structure of the page.
CSS: We strongly recommend the use of Cascading Style Sheets (CSS). To increase accessibility, however, you should organize documents so they may be read without style sheets.
SSI: Server-Side Includes (SSI) act as the "style sheets of content," helping facilitate consistency and integrity of content and making wide-scale updates of common elements easier.