title: Why is this CSS property not detailed in the JavaFX CSS Reference Guide?
body: <p>I'm learning how to use CSS to style UI components in JavaFX, and in going through Oracle's tutorials I found the color property <code>-fx-base</code> in a piece of example code:
  <a href="http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/button.htm" rel="nofollow">http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/button.htm</a> (example 3-5, the very last piece of code on the page).</p>
  
  <p>In the complete JavaFX CSS Reference Guide (<a href="http://docs.oracle.com/javase/8/javafx/api/javafx/scene/doc-files/cssref.html" rel="nofollow">http://docs.oracle.com/javase/8/javafx/api/javafx/scene/doc-files/cssref.html</a>), there is clear documentation on every property I have seen so far EXCEPT <code>-fx-base</code>, and it seems that it isn't in the reference guide at all. Am I searching in the wrong place or is it missing? Are there any other undocumented properties?</p>