The W3 Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check HTML and XHTML documents for well-formed markup. W3C validation is important for browser compatibility and site usability.
The W3 Validation Service is a validator by the World Wide Web Consortium that allows Internet users to check HTML and XHTML documents for well-formed markup.
w3c is HTML standard of a website, you can check website standard for browser compatibility and site usage to check universal standard to access easy of website.
If you are a developer of a template engine, authoring tool, or content management system, use the HTML validator to fix problems in your implementation. You can also incorporate the HTML validator in your software or back-end. The source code of the HTML validator is freely available.