Unicorn is W3C's unified validator, which helps people improve the quality of their Web pages by performing a variety of @@checks@@. Unicorn gathers the results of the popular HTML and CSS validators, as well as other useful services.

This documentation addresses these audiences:

• Users, those who want to check their Web pages and understand how to fix them based on Unicorn results.
• Developers, those who wish to add new services, work on existing services, or help develop the underlying Unicorn framework.
• Server Managers, those who wish to run their own Unicorn service locally.

 Make a donation to support the free Unicorn service and see below for providing feedback or reporting a bug.

Use Unicorn

Learn more about how to use Unicorn to improve the quality of your Web pages.

• @@List of validator services available through Unicorn@@
• How to use Unicorn?
• Frequently Asked Question (FAQ)
• Advanced use?

Develop Unicorn and Validation Services

Add a new service to Unicorn

Unicorn is designed so that people may easily create and integrate new validation services.

• develop and test a new service
• tutorial on creating a new service

Improve Unicorn

W3C welcomes community participation to improve the open source Unicorn project.

• download and install Unicorn
• overview of Unicorn architecture
• code "walkthrough"?

If you are interested in contributing to the Unicorn code base, please write to public-qa-dev@….

Run a Unicorn Server

You may also wish to download and install your own Unicorn server (e.g., behind a company firewall).

• download and install Unicorn
• create a custom set of services for your audience (a "tasklist")

Suggestions and Bug Reports

We welcome your comments, suggestions, and bug reports.

• For general discussion and feedback, use the  publicly archived mailing-list public-unicorn@…
• For bug reports, open a new ticket in the issue database.
• For new feature ideas, send us an enhancement request.

Thanks for supporting Unicorn!