This module gives users the ability to validate (X)HTML content of documents for markup errors, broken links, accessibility
problems and mobile device friendliness.
This simple module allows you to check chosen page for broken links and validate its compatibility with standards for accessibility, (X)HTML and mobile websites. It uses on-line services, so the page you're checking must be published and publicly accessible. The tool integrates directly into the Properties menu of the document, so any user can use it to validate the content.
For more details please see the instructions in the package.