W3C Markup Validation Service
Check and validate HTML, XHTML, and other markup languages for web standards compliance.
About W3C Markup Validation Service
The W3C Markup Validation Service is a free tool that checks web documents for compliance with markup standards such as HTML, XHTML, MathML, SMIL, and SVG. It helps identify errors, improve compatibility across browsers and devices, and serves as an educational resource for developers.
Key features
Standards Compliance
Ensures your web pages adhere to established web standards, enhancing interoperability and accessibility.
Error Identification
Detects errors and warnings in HTML and XHTML documents, simplifying debugging and improving code quality.
Improved Compatibility
Validates markup to ensure consistent rendering across different browsers and devices, delivering a seamless user experience.
Free of Charge
Provided by W3C at no cost, making it accessible for developers of all skill levels to enhance their projects.
Educational Tool
Helps beginners learn web development by highlighting common mistakes and promoting best practices.
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