CSS Basic Tooltip

First a simple example using visibility:hidden:

Roll your mouse over the following Rollover here please As you can see a nice little message box appears over the text and provides some more information..

Second example

This example uses an off screen technique which is better for Assistive Technologies (screen readers etc.):

Roll your mouse over the following Rollover here please As you can see a nice little message box appears over the text and provides some more information..