{{Short description|Software to check code or a document}} {{Wiktionary|validator}} {{otheruses}} {{Anchor|validator}} 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,<ref>{{cite book|last=Lemay|first=Laura|authorlink=Laura Lemay|title=Teach Yourself More Web Publishing with HTML in a Week|location=Indianapolis, Ind|publisher=Sams.net Pub|year=1995|url=https://books.google.com/books?id=xODryMyRGvcC&q=%22html+Validator%22|page=198|isbn=9781575210056}}</ref><ref>Tittel, Ed, and Mary C. Burmeister. HTML 4 for Dummies. --For dummies. Hoboken, NJ: Wiley Pub, 2005.</ref> CSS, and XML documents like RSS feeds, though it can be used for any defined format or language.
''Accessibility validators'' are automated tools that are designed to verify compliance of a web page or a web site with respect to one or more accessibility guidelines (such as WCAG, Section 508 or those associated with national laws such as the Stanca Act).
==See also== * CSS HTML Validator for Windows * HTML Tidy * W3C Markup Validation Service * Well-formed element * XML validation
==References== {{reflist}}
== External links == * W3C's [https://validator.w3.org/ HTML Validator] * W3C's [http://jigsaw.w3.org/css-validator/ CSS Validator]
Category:Debugging Category:HTML Category:XML software