|1= (positional parameter) - the text that goes inside of the parentheses.
|s=or|2= - "s" stands for "size". size=SIZE（px, em, pt, or %. If |s=100% then the size of the parentheses is not changed (i.e. the parentheses have their usual size). If |s=200% (resp. |s=50%) then the parentheses are twice (resp. half) their usual size.
You may use the positional parameter 2 instead of s (e.g. you may use {{Pars|text|50%}} in place of {{Pars|text|s=50%}}).
If neither the parameter s nor 2 is assigned a value then the size of the parentheses is not changed (i.e. the parentheses have their usual size) and no call to the {{font}} template is made.
If{{math|{{pars|X|210%}} < 0}}, then {{mvar|X}} is negative.
If(X) < 0, then X is negative.
If{{math|{{pars|X|s=210%}} < 0}}, then {{mvar|X}} is negative.
If(X) < 0, then X is negative.
Content and parentheses are resized. Using parameter s for size of parentheses[edit]
If{{math|{{pars|{{large|X}}|s=210%}} < 0}}, then {{mvar|X}} is negative.
If(X) < 0, then X is negative.
Content and parentheses are resized. Passing arguments by their position[edit]
Here we indicate the size of the parentheses (as a percentage) by using parameter position number 2 rather than the named parameter |s=.
If{{math|{{pars|{{large|X}}|210%}} < 0}}, then {{mvar|X}} is negative.
If(X) < 0, then X is negative.
This is equivalent to the following two lines:
If{{math|{{pars|1={{large|X}}|2=210%}} < 0}}, then {{mvar|X}} is negative.
If(X) < 0, then X is negative.
If{{math|{{pars|{{large|X}}|2=210%}} < 0}}, then {{mvar|X}} is negative.
If(X) < 0, then X is negative.
WARNING: in the following line, 1 is first set to {{large|X}} and then because "210" is the first unlabelled positional argument, the value of 1 is overwritten and replaced by "210" (which is why 210 appears inside the parentheses) while the positional argument 2 is never assigned a value (which is why the parentheses have their usual size). This is a documented quirk of Wikipedia templates that could occur with many templates that take two or more arguments.
If{{math|{{pars|1={{large|X}}|210%}} < 0}}, then {{mvar|X}} is negative.
If(210%) < 0, then X is negative.
WARNING: the following is NOT valid since it would attempt to place the text "210" inside the parentheses (this is because the positional parameter 1 is assigned the value 210) and then attempt to pass X as the percentage number to the template {{font}} (this is because the positional parameter 2 is assigned the value {{large|X}}) even though it is not a valid number.
If{{math|{{pars|210%|{{large|X}}}} < 0}}, then {{mvar|X}} is negative.
It results in the following ill-formed output:
If<span style="font-family:sans-serif;font-size:X;color:black;background-color:transparent;;">(210%<span style="font-family:sans-serif;font-size:X;color:black;background-color:transparent;;">) < 0, then X is negative.
