Template:Sd/doc
The template draws a html block, where some text if left-aligned, and another text is right-aligned. See it:Template:Sd. The names come from "Sinistra-Destra" (left-right into Italian).
An example:
Code:
<div style="width:100px"> {{Sd|Cap.|I.}} {{Sd|Cap.|III.}} {{Sd|Cap.|XVIII.}} {{Sd|Cap.|XXXVIII.}} </div>
Result:
Cap.I. Cap.III. Cap.XVIII. Cap.XXXVIII.