Template documentation:

This template allows creating a text in the box of the mouse-over effect. Check http://en.wikiversity.org/wiki/Help:Mouse-over and http://en.wikiversity.org/wiki/Template:H:title. It takes two parameters (link=yes/no and dotted=yes/no), and creates underlined text with a hover box for many modern browsers supporting CSS.

Usage:

Copy the following code into your page:

{{H:title|link=no|dotted=yes|This is the mouse-over text|Hover here}}

This will create:
Hover here.