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XML Editor, XMLwriter for Windows, is a powerful award-winning XML development tool that supports XML, XSLT, DTD, XSD Schema, CSS, and HTML editing. Within the editor you can convert XML to HTML using XSLT stylesheets, or format and preview XML do...

The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.

Free web development/design tutorials. Includes CSS, Javascript, AJAX, ColdFusion, and HTML tutorials, code examples, layout help and references. Complete list of HTML tags and CSS properties. Also contains resources and background overview of XML, A...

XML.com, where the XML community shares XML development resources and solutions, features timely news, opinions, features, and tutorials; the Annotated XML specification created by Tim Bray; authoring tools, XML developer resources, interactive forum...

SitePoint.com - With a vast variety of web design tutorials and articles coupled with a vibrant and well informed community, SitePoint the natural place to go to grow your online business

HTMLHelp.com is maintained by the Web Design Group to provide Web authoring reference material, tips, and answers to frequently asked questions.

Total Validator is an (X)HTML validator, an accessibility validator, a spell checker, and a broken links checker all rolled into one tool allowing one-click validation of your entire site.