W3C plans to stop providing the on-line unified validator service Unicorn as of 31 March 2023, due to lack of resources to maintain the project. We encourage interested people in the community to fork Unicorn. We have many other developer tools such as the markup and CSS validators, and checkers like the Internationalization checker, link and feed checkers.
https://www.w3.org/blog/news/archives/9826
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