"HTML is the lingua franca for publishing hypertext on the World Wide Web. It is a non-proprietary format based upon SGML, and can be created and processed by a wide range of tools, from simple plain text editors - you type it in from scratch - to sophisticated WYSIWYG authoring tools. HTML uses tags such as <h1> and </h1> to structure text into headings, paragraphs, lists, hypertext links etc."
- HTML 4.01 Specification
- XHTML™ 1.0 The Extensible HyperText Markup Language (Second Edition)
- XHTML™ 1.1 - Module-based XHTML
- HTML5 - A vocabulary and associated APIs for HTML and XHTML
- HTML5 - IANA considerations
- XHTML2 Working Group Home Page - What is HTML?
- The 'text/html' Media Type [RFC2854]
- The 'application/xhtml+xml' Media Type [RFC3236]
- The A element
- Document relationships: the LINK element
- Client-side image maps: the MAP and AREA elements