• The W3C Markup Validation Service

    validator.w3.org
    Note: file upload may not work with Internet Explorer on some versions of Windows XP Service Pack 2, see our information page on the W3C QA Website.
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  • How to Use the W3C Validator for HTML Code

    linkedin.comadvice/1/how-do-you-use-w3c-…
    The best way to fix the errors and warnings is to follow the guidelines and recommendations provided by the W3C validator.

  • HTML Validation · WebPlatform Docs

    webplatform.github.iodocs/guides/html_validation/
    This article introduces the concept of validation, and shows how to use the online W3C validator to validate your HTML.

  • HTML Validator Online - AppDevTools

    appdevtools.comhtml-validator
    HTML Validator is a free online developer tool to validate HTML code against the W3C standards as known as HTML linter instantly.

  • W3C Markup Validation Service - Wikipedia

    en.wikipedia.orgW3C Markup Validation Service
    In September 1997, Oskoboiny began working for the W3C, and on December 18, 1997, the W3C announced its W3C HTML Validator based upon his works.[4]...

  • W3Schools.com — W3.CSS Validation

    w3schools.comw3css/w3css_validation.asp
    The W3C CSS Validator checks for CSS1, CSS2, CSS3, and CSS4 properties. Some browsers use vendor extensions to simulate CSS3 and CSS4 properties.
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  • GitHub - w3c/markup-validator

    github.comw3c/markup-validator
    The Markup Validator is a free service by W3C that helps check the validity of Web documents.
    • Issues:
      31

  • W3C Web Validator - Visual Studio Marketplace

    marketplace.visualstudio.comitems…
    W3C Web Validator. Celian Riboulet. | 139,788 installs. ... VSCode W3C Web Validator. Check the markup validity of your web documents !

  • Free Online HTML Validator - FreeFormatter.com

    freeformatter.comhtml-validator.html
    Validates HTML files for compliance against the W3C standards and performs linting to assess code quality against best practices.

  • W3C Validator: What It Is & Why It Matters For SEO

    searchenginejournal.comw3c-validator-guide/…
    The W3C validator is free to use, and you can access it here. With the W3C validator, it’s possible to validate your pages by page URL, file upload, and Direct Input.