HTML Useful Resources (DOCTYPE Structure, Validation)

Different Types of DOCTYPE http://www.w3.org/QA/2002/04/valid-dtd-list.html XHTML 1.0 Strict Cheat Sheet http://www.w3.org/2010/04/xhtml10-strict.html HTML Document Structure http://www.w3.org/TR/html401/struct/global.html Markup Validation Tool http://validator.w3.org/ The Future of HTML http://dev.w3.org/html5/spec/Overview.html