You can't go on the Internet without seeing HTML in action, but the Internet is a great place for finding out about HTML, too. The following table lists some valuable online resources for more information about HTML.

Name Description
HTML Tutorial This W3Schools site provides a complete tutorial and references on how to use all HTML tags.
W3C Markup Validation Service Use this site to check the validity of your HTML. The validator also checks tags against doctype.
Index of Elements Index of all HTML elements with links describing how to use them.
HTML 4.0 Guidelines for Mobile Access W3C guidelines for creating HTML4 websites.
HTML5 Overview of HTML5 guidelines.
HTML5 Demos and Examples Several good examples of how to use HTML5 for specific applications, complete with browser compatibility.
HTML5 Tag Reference A complete reference of HTML5 tags and how to use them.
The Great WebKit Comparison Table A chart of WebKit HTML tags and which devices support them.