I'm trying to understand Tabview and how to modify it. It looks like "Tabview" comes from the Yahoo User Interface (YUI) library of widgets. Yahoo stopped maintaining the library in 2014 and it moved to some other organization hosted on Github.
I tried to look this information up. Where are the CSS rules and classes coming from? They look good and they work, but I don't see where this information comes from. Also the YUI documentation states that I need this statement in my document for it to work. "<script src="http://yui.yahooapis.com/3.18.1/build/yui/yui-min.js"></script>" does wikidot add that for me automatically?