Board Thread:Support Requests - Designing Your Wikia/@comment-25568235-20160207202909/@comment--20160207210355

You can test it in your personal CSS page on any wiki.

For example, creating the page http://community.wikia.com/wiki/User:LonePudding/wikia.css (results of code would only appear on "Community") would allow you to test codes. The code will only appear for you, and not for anyone else.