Web Resources
HTML and XHTML
- HTML 4.01 Specification
- XHTML 1.0 Specification
- MathML 2.0 Specification
- HTML 4.01 and XHTML 1.0 Reference
- Web Content Accessibility Guidelines
- W3C Markup Validation Service
Cascading Style Sheets
- CSS Level 1 Specification
- CSS Level 2 Specification
- CSS Reference
- Yahoo! User Interface Library CSS Reset
- W3C CSS Validation Service