Context Sensitive XHTML - This paper tries to introduce some new elements into the HTML language. The purpose of these elements is to create documents that can contain different pieces of information at the same time. These various pieces of information can be presented to the user on demand. Some possible applications and solutions are also given.
HTML 4.01 / XHTML 1.0 Reference - Element and attribute definitions and examples, with alphabetical index, and also sorting by function.
HTML and XHTML Document Type Definitions - This page lists and provides links to standard DTDs and SGML declarations for HTML and its successor language, XHTML.
XHTML 1.0 Reference - Complete reference with examples and relevant links to the W3C standard.
