If you would like to check you sites and validated them you can use the online validators below.

• W3 HTML with CSS or CSS only validator
• W3 HTML validator that checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML
• W3 link checker that reads an HTML or XHTML document and extracts a list of anchors and links
• W3C Feed Validation Service, a free service that checks the syntax of Atom or RSS feeds
• WDG HTML Validator for HTML and XHTML validation
• Feed Validator for Atom and RSS and KML
• Web 2.0 Validator
• Semantics validator by W3, geared by an XSLT stylesheet, tries to extract some information from a HTML semantic rich document. It only uses informations available through a good usage of the semantics defined in HTML
• W3 RDF validation service is based on Another RDF Parser (ARP). It currenlty uses version 2-alpha-1
• WebXACT is a free online service that lets you test single pages of web content for quality, accessibility, and privacy issues
• WAVE is a web accessibility evaluation tool
• The HiSoftware Cynthia Says portal is a web content accessibility validation solution