XHTML and CSS
Printer-friendly VersionXHTML: Guidelines
National Library of Medicine (NLM) Web pages must be authored in structural XHTML 1.0 Transitional. Page authors should follow accessibility guidelines in compliance with Section 508 and the WAI so that our site’s content will be made available to the widest possible number of people, browsers, and Internet devices. In addition, all XHTML must validate.
- Converting HTML documents to XHTML
- Quick and easy tips for converting your code to XHTML.
- XHTML Reference
- The rules of XHTML.
- What is XHTML?
- A brief introduction to the foundation of XHTML.
- XHTML Accessibility
- Making sure your pages can be read by all visitors, browsers, and devices.
- XHTML Validation
- Ensure interoperability by avoiding errors and sticking to coding standards.
CSS: Style Sheets & Tips
Web sites and web-based applications must use valid Cascading Style Sheets (CSS) to control typography, color, and other layout elements. Style sheets must be linked in a way that accommodates the capabilities of new and old browsers.
- CSS Guidelines
- Tips on authoring and linking to style sheets.
- NLM Style Sheets
- NLM's official Cascading Style Sheets.
- CSS Validation
- Ensure style sheets are error-free.
If you wish to create your own style sheets, please discuss your requirements with your NLM project coordinator.