Template:About parameters/doc

This template demonstrates what will happen when you attempt to pass parameters to a template in various ways.

This template takes 4 parameters -- a, b, c, and d. In the example below, they are used in the template call as follows:
 * a -- leave out of the call
 * b -- include, but without an =
 * c -- include, with an = but no value
 * d -- include, with an = and a value