HTML, HyperText Markup Language, the heart of all webpages. It is used to define the content of a webpage and is used to generate the DOM, Document Object Model, in browsers. The DOM is a computer representation of the Document which in this case is the webpage.
HTML was first proposed in 1989 and implemented in 1990, was based on SGML, Standard Generalized Markup Language. SGML itself was based on GML, Generalized Markup Language, first developed in the 1960s. There have been multiple versions of HTML; HTML, HTML 2.0, HTML 3.0, HTML 4.0, XHTML 1 and HTML 5 with minor versions such as HTML 3.2 and HTML 4.01. The HTML Standard is maintained by the World Wide Web Consortium (W3C).
Composing Good HTML 3.0
HTML Goodies: The Ultimate HTML Resources
HTML Help by the Web Design Group
Chock full of references, tools and help.
HTML META, REL and REV Tags
Information about Meta tags with links to the RFC documents about them.
Brought to you by w3schools
How well does your browser support HTML5?
Internet Clocks, Counters and Countdowns
Links to clocks that you can use use on your wepage.
The HTML Writers Guild
HWG is an organization the provides Web Design Training and Certification.
The WebKit Open Source Project
HTML, The Web's Core Language.
HTML 4.01 Specification, 24-December-1999
HTML5 - A vocabulary and associated APIs for HTML and XHTML, 28-October-2014.
W3C XHTML 1.0
XHTML ™ 1.0 - The Extensible HyperText Markup Language (Second Edition) Revised 1-August-2002.
Web Browser Standards Support
This document will summarize the level of support for web standards and maturing technologies in popular web browsers. It covers the Internet Explorer, Firefox, and Opera web browsers, with focus on the HTML, CSS, DOM, and ECMAScript technologies.
Web Site Work Station
Turorials for HTML, CSS and Website Design.
Webpages That Suck
Learn good web design by looking at bad web design. Definitely one of my favorite websites. It teaches good techniques by using actual bad websites. Not only does it point out the flaws, it explains why they are wrong and what to do to do it right.