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  1. This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.

    • Docs

      Information on source code availability and download...

    • About

      About this service. The Markup Validator is a free service...

    • non-DTD-based Validator

      Chętnie wyświetlilibyśmy opis, ale witryna, którą oglądasz,...

    • Help FAQ

      About the Markup Validator Help me! I clicked on an icon and...

    • News

      The RPM spec file is now available in the download. Update...

    • MobileOK Content

      Be mobile friendly. The Mobile Checker is a tool for Web...

    • W3C RDF Validation Service

      Check and Visualize your RDF documents. olde servlet. Enter...

  2. Download the latest release version. Read the usage guide. If for some reason you'd rather install and run a service based on the same source as the W3C Markup Validator, this page provides the following information:

  3. This guide for the installation of the W3C Markup Validator was contributed by David Tibbe. It is also available in german. See the generic installation guide for instructions on how to install the Markup Validator on other platforms and links to other platform-specific guides.

  4. Information on source code availability and download instructions for the Markup Validator. Installation Guide. Step-by step guide for the installation of the Markup Validator on your server. Markup Validator Web Service API. Use the validator from your applications with the experimental Markup Validator Web service, and its open API.

  5. The tool consists of a perl-based CGI script that uses DTD to verify the validity of HTML3, HTML4 and XHTML documents; it also incorporates by reference the NU Validator used to validate HTML5 / HTML LS documents.

  6. 7 wrz 2023 · The W3C Markup Validator is an open source software and free W3C service helping Web Document authors fix errors in the markup of their HTML, XHTML, MathML etc. resources.

  7. These features are included in the latest version of the W3C Validator (version 0.8.0). Unit Tests now included, additional documentation and coding standards fixes.

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