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1. validator.w3.orgThe W3C Markup Validation Service

   validator.w3.org

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   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

     Check the markup (HTML, ... Documentation for the W3C Markup...

   • About

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

   • non-DTD-based Validator

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

   • Help FAQ

     The Markup Validator is a free tool and service that...

   • News

     0.8.4 may sound like a very minor step from the version...

   • 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...

   • About the W3C Markup Validation Service

     This validator can process documents written in most markup...

2. validator.w3.org › docs › helpHelp for The W3C Markup Validation Service

   validator.w3.org › docs › help

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   Learn how to use the W3C Markup Validator to check the syntax of Web documents written in formats such as (X)HTML. Find answers to common questions about validation, error messages, and other validators.

3. validator.w3.org › aboutAbout the W3C Markup Validation Service

   validator.w3.org › about

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   The W3C Markup Validation Service is a free service that helps check the validity of Web documents written in HTML, XHTML, MathML, SMIL, SVG and other markup languages. It also conforms to ISO standards and provides documentation, feedback and related resources.

4. en.wikipedia.org › wiki › W3C_Markup_Validation_ServiceW3C Markup Validation Service - Wikipedia

   en.wikipedia.org › wiki › W3C_Markup_Validation_Service

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   Learn about the W3C validator that checks HTML and XHTML documents for well-formed markup against a DTD. Find out the history, limitations, and alternatives of this tool for web standards compliance.

5. validator.w3.org › fragment-uploadW3C Markup Validation Service: Validate by Direct Input

   validator.w3.org › fragment-upload

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

6. www.w3.org › wiki › MarkupValidatorMarkupValidator - W3C Wiki - World Wide Web Consortium (W3C)

   www.w3.org › wiki › MarkupValidator

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   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. pl.wikipedia.org › wiki › W3C_Markup_Validation_ServiceW3C Markup Validation Service – Wikipedia, wolna encyklopedia

   pl.wikipedia.org › wiki › W3C_Markup_Validation_Service

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   W3C Markup Validation Service – darmowa usługa udostępniana przez W3C. Pozwala sprawdzić zgodność dokumentu HTML ze standardami HTML lub XHTML, a także umożliwia autorom strony internetowej znalezienie błędów.