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+# W3C Markup Validator
+
+The Markup Validator is a free service by W3C that helps check the validity of Web documents.
+Most Web documents are written using markup languages, such as HTML or XHTML.
+These languages are defined by technical specifications, which usually include a machine-readable formal grammar (and vocabulary).
+The act of checking a document against these constraints is called validation, and this is what the Markup Validator does.
+
+## Copyright
+
+[W3C Software License and Notice](http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231).