A11ygator is a free Chrome extension developed by Chialab. It is designed to help web developers validate the accessibility of their websites against W3C's Web Content Accessibility Guidelines (WCAG).

Once the extension is activated, A11ygator continuously monitors the HTML document for any content changes and generates a comprehensive report that includes errors, warnings, and notices. This allows developers to identify and address accessibility issues in their websites.

One of the standout features of A11ygator is its integration with DevTools. This makes it easy for developers to inspect elements and make quick updates to CSS rules or HTML attributes in order to meet the required WCAG standards.

With A11ygator, web developers can ensure that their websites are accessible to all users, regardless of their abilities or disabilities. It is a valuable tool for those who prioritize inclusivity and want to create a more accessible web.