Web Content Accessibility Guidelines
¨Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g. fonts, colors, spacing) to Web documents.
¨<style type="text/css">
¨           body { color: black; background: white; }
¨         </style>
Misusing markup for a presentation effect eg using a header to change font size will confuse specialist software.
Use mathML to mark up mathematical equations and style sheets to format text.