History
The Markup Validation Service began as The Kinder, Gentler HTML Validator, a project by Gerald Oskoboiny. It was developed to be a more intuitive version of the first online HTML validator written by Dan Connolly and Mark Gaither, which was announced on July 13, 1994.
In September 1997, Oskoboiny began working for the W3C, and on December 18, 1997, the W3C announced its W3C HTML Validator based upon his works.
W3C also offers validation tools for web technologies other than HTML/XHTML, such as CSS, XML schemas, and MathML.
Read more about this topic: W3C Markup Validation Service
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