w3c-markup-validator

W3C Markup Validator
  https://validator.w3.org/about.html
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The W3C Markup Validator is a CGI script which lets you enter the URL of a web page which will be then checked against a validating SGML parser for conformance to official W3C recommendations. Pages can also be uploaded.

These are the same scripts that are available on the W3C web site, http://validator.w3.org/.