Template documentation

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

{{About parameters|b|c=|d=value}}

name	#if, no bar	#if, with bar	subst	+, -, =
a	non-empty	empty	subst	!=
b	non-empty	empty	subst	!=
c	empty	empty		=
d	non-empty	non-empty	value	=