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Instant HTML validation for web developers. Check markup quality offline by AIO.com.ai MarkupLint is a powerful HTML validation extension for web developers and designers. Instantly analyze any webpage's HTML structure, accessibility, and semantic markup quality without leaving your browser. Press Alt+Shift+V or click the toolbar icon to validate the current page. Results appear in the browser console with color-coded issues, warnings, and suggestions. Features include DOCTYPE validation, heading hierarchy checks, accessibility audits, duplicate ID detection, and semantic HTML5 verification. Works 100% offline with no external requests. Perfect for debugging, learning web standards, and ensuring clean, valid HTML markup. Developed by AIO.com.aiRetry