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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

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

   • 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

     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...

2. www.w3schools.com › php › php_form_validationPHP Form Validation - W3Schools

   www.w3schools.com › php › php_form_validation

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   PHP Form Validation. Think SECURITY when processing PHP forms! These pages will show how to process PHP forms with security in mind. Proper validation of form data is important to protect your form from hackers and spammers!

3. stackoverflow.com › questions › 2987116validation - How to validate a PHP file with W3C.org - Stack...

   stackoverflow.com › questions › 2987116

   7 cze 2010 · W3C doesn't standardize php, so you can't validate the php files themselves. But, to validate the HTML or XHTML content of your site, just paste the url into the W3C validator.

4. dev.w3.org › validator › htdocsDocumentation for the W3C Markup Validator

   dev.w3.org › validator › htdocs

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   Use the validator from your applications with the experimental Markup Validator Web service, and its open API. Developer Information. Information for programmers wanting to play with the validator's code, and/or contribute to its development. SGML, Validation and the Markup Validator.

5. 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.

6. 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.

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

   en.wikipedia.org › wiki › W3C_Markup_Validation_Service

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   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).