Validator.nu

Validator.nu is an online tool designed to check the quality and compliance of web content against established web standards. It evaluates HTML, CSS, and other web technologies to ensure that websites are accessible, functional, and properly coded. By providing feedback on errors or issues, Validator.nu helps web developers improve their websites, ensure compatibility across different browsers, and enhance user experience. It serves as a resource for anyone looking to maintain high standards in web design and development.