eturns the renderer type of the <a href="../../../../jakarta/faces/render/ClientBehaviorRenderer.html" title="class in jakarta.faces.render"><code>ClientBehaviorRenderer</code></a> to use for the behavior. The default implementation
 returns null. Subclasses should either override this method to return a string that identifies the type of
 <a href="../../../../jakarta/faces/render/ClientBehaviorRenderer.html" title="class in jakarta.faces.render"><code>ClientBehaviorRenderer</code></a> to use, or should ove