What is Unicorn

W3C, home to the development of the technical specifications known as Web Standards, historically also provides online tools and services to check that content published on the Web follows these specifications, as well as a number of other tools to improve the global quality of Web sites. The most popular are the Markup Validator, CSS Validator, Link Checker...

All these services are individually useful, but it is often cumbersome for developers of Web content to use them all sequentially and test as many aspects of Web quality as possible. Unicorn aims to provide the big picture about the quality of a Web page, by gathering the results of all these tools into a single page.

Unicorn does not replace each individual validator, it unifies them, and increases their usability by providing a one-step check for the many facets of Web Quality and Web Standards Conformance.

Use it

• The official, stable Unicorn is available at  http://validator.w3.org/unicorn/.
•  A development version is also available. This version contains the latest changes made to Unicorn's code base, but might be unstable or contain broken features.
• As an open-source software, everyone can freely download, install and use Unicorn. More information is available in the installation documentation?.

To get more information on Unicorn's features and how to use it, make sure to check the documentation?.

Get involved

See how you can help us and get involved