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  1. validator.w3.org

    W3C's easy-to-use markup validation service, based on SGML and XML parsers.
    • non-DTD-based Validator

      We would like to show you a description here but the site won't allow us.

    • Find Broken Links

      We would like to show you a description here but the site won't allow us.

    • Contribute

      Contribute - The W3C Markup Validation Service

    • About

      About this service. The Markup Validator is a free service by W3C that helps check the validity of Web documents.. Most Web documents are written using markup languages, such as HTML or XHTML.These languages are defined by technical specifications, which usually include a machine-readable formal grammar (and vocabulary). ). The act of checking a document against these constraints is called ...

    • Docs

      Docs - The W3C Markup Validation Service

    • Feedback

      Feedback - The W3C Markup Validation Service

  2. en.wikipedia.org

    The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.
  3. Released version 0.7.1 of the Markup Validator, a maintenance release introducing performance enhancements and including minor fixes in the user interface and in the "Direct Input" validation results. These are the most recent major changes to this service. See " What's New " for more details.
  4. newton.ex.ac.uk

    The W3C MarkUp Validation Service was created and maintained by Gerald Oskoboiny . In a previous incarnation it was known as "The Kinder, Gentler, HTML Validator", but has since found a new home at W3C, and is now maintained under the auspices of the Quality Assurance Activity.
  5. stackoverflow.com

    The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies.
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    W3C Markup Validation Service

    Validator service by the World Wide Web Consortium
    validator.w3.org

    The Markup Validation Service is a validator by the World Wide Web Consortium that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition. Markup validation is an important step towards ensuring the technical quality of web pages. However, it is not a complete measure of web standards conformance. Though W3C validation is important for browser compatibility and site usability, it has not been confirmed what effect it has on search engine optimization. As HTML5 has removed the use of DTD in favor of a "Living Standard", the traditional Markup Validation Service is not applicable to these formats. Validation is instead performed using an open-source "Nu Validator", an instance of which is provided by W3C. Wikipedia

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