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- CSE HTML Validator - CSE html validator is easy to use offline html, xhtml, and CSS syntax checker/html validator, accessibility checker.
https://www.htmlvalidator.com/
- Relaxed - Powerful HTML validation using relax NG and schematron schema.
https://relaxed.sourceforge.net/
- W3C - W3C's easy-to-use html validation service, based on an SGML parser.
https://validator.w3.org/
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