Validity is a free add-on for the Chrome browser that allows users to easily validate HTML documents without leaving the current page. Developed by Ian Renyard, Validity can be accessed by clicking the icon in the address bar or by using the keyboard shortcut Alt+Shift+V.

With Validity, users can quickly validate their HTML documents and view the results in Chrome's JS console. The add-on also provides a tool tip that displays the number of validation errors, and users can access detailed information in the console tab of Chrome's developer tools.

One of the notable features of Validity is the option to use the W3C Validation Service or the Nu Validator. Additionally, the add-on allows users to install their own instance of the W3C Validation Service.

Please note that bug reports and feature requests should not be posted in the reviews. Instead, users are encouraged to use the GitHub issue system for such purposes.

Validity has undergone several updates, with the latest versionreleased onThis update includes the correction of info message labels.

Overall, Validity is a valuable tool for web developers and designers who want to ensure the validity of their HTML documents directly within the Chrome browser.