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Documentation of the Programmatic Interface (API) to The W3C Markup Validation Service
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Error 404 · Issue #57 · w3c/markup-validator · GitHub
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CSS Validator User Manual
Validators and linting tools | Responsive Web Design with HTML5 and CSS3 - Second Edition
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Hackers are using your website http://validator.w3.org/ from Romain C on 2020-11-22 (www-validator@w3.org from November 2020)
Error 404 · Issue #57 · w3c/markup-validator · GitHub
How To Validate HTML - Using an HTML Validator - YouTube
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warnings by validation for http://validator.w3.org from Serguei Zouikov on 2018-02-20 (www-validator@w3.org from February 2018)
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