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A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the context of validating HTML,[1][2] CSS and XML documents or RSS feeds though it can be used for any defined format or language.

See also[edit]


  1. ^ Lemay, Laura (1995). Teach Yourself More Web Publishing with HTML in a Week. Indianapolis, Ind: Pub. p. 198. 
  2. ^ Tittel, Ed, and Mary C. Burmeister. HTML 4 for Dummies. --For dummies. Hoboken, NJ: Wiley Pub, 2005.