Reference
Wikimedia — wikimedia.org
Valid XHTML 1.0 StrictWikimedia Foundation - Wikipedia - Wiktionary - Wikiquote - Wikibooks - Wikisource - Wikinews - Wikimedia Commons - Wikispecies -...
Wikipedia — www.wikipedia.org
Valid XHTML 1.0 StrictWikipedia is a free, multilingual, open content encyclopedia project operated by the non-profit Wikimedia Foundation. Its name is a...
Wikiquote — www.wikiquote.org
Valid XHTML 1.0 StrictA free quote database built collaboratively using Wiki software, a sister project to Wikipedia. (GNU Free Documentation License)
Wiktionary — www.wiktionary.org
Valid XHTML 1.0 StrictWiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in...
XHTML Reference — xhtml.com
Valid XHTML 1.0 StrictThis reference is a best-practice approach, based on XHTML 1.0 Strict / XHTML 1.1.
W3schools — www.w3schools.com
Valid XHTML 1.0 TransitionalW3Schools is a web developer's portal, with tutorials and references relating to web development subjects, including HTML, XML, CSS, and...
Addresses.com — www.addresses.com
Valid HTML 4.01 TransitionalWhite Pages and Yellow Pages lookup. Reverse phone directory, address and phone number search. Other services include email lookup, reverse...
HTMLHelp — htmlhelp.com
Valid HTML 4.01 TransitionalHTMLHelp.com is maintained by the Web Design Group to provide Web authoring reference material, tips, and answers to frequently asked...