HTML Nesting Validator
Find mismatched closing tags and obvious invalid HTML nesting locally. Runs locally and returns a reviewable report.
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Input is limited to 200000 characters. Results are computed locally and exported as JSON. Paste HTML markup, not a website URL. Up to 200,000 characters. Review the settings before running.
Your result
How to use HTML Nesting Validator
- Paste the HTML.
- Run the local check.
- Review tag-stack issues and download the report.
Tag structure
The validator checks a bounded tag stack. Browser parser repairs, semantics and accessibility require separate review.