Where can I get the Tidy Plugin?
Visit the Tidy Plugin project page.

What are the requirements for PHP Tidy to work?
You need to have PHP5 and the PHP Tidy Extension published. If you have PHP4, then you will need to install the PHP Tidy Extension as it does not bundle with PHP4, then publish it.
Here is instructions on installing the PHP Tidy extension.

How do I view if PHP Tidy is working on my site?
Once you have installed and published PHP Tidy Plugin, view the source of your page. There will be a comment in the source that tells you if Tidy is working or not.

Is the xHTML always xHTML Compliant?
Unfortunately not. It will fix broken tags and attributes, however it will not replace tags such as <font> with valid xHTML tags. I believe this is just an error on my part as the documentation states that xHTML output is an option. If you have any suggestions please let me know.

Does Tidy Clean my CSS also?
No, unfortunately not. We will be releasing a plugin that will do this however.