The following resources contain additional information on Web Developers Guide. Please use them to get more in-depth knowledge on this.
W3C Consortium - Official web site of W3C Consortium. This site should be book marked for easy access.
W3C Specifications List - A comprehensive list of W3C standards. You will find most latest versions available on this page.
HTML 4.01 Specification - A complete specification of HTML4.01, the most popular version of HTML.
Starting with HTML + CSS - A W3C tutorial on HTML and CSS.
XHTML1.0 - W3C XHTML 1.0. It offers the same flavors as HTML 4.0 and 4.01, reformulated in XML, with minor restrictions.
XHTML1.0 - W3C XHTML 1.1. It is based on XHTML 1.0 Strict, but includes minor changes.
W3C HTML Validation Service - Validate your HTML/XHTML document against W3C Standard.
Offline HTML Validator - Download and install this software to validate your HTML/XHTML pages offline.
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