Click here to see a minimally configured tooltip. By default tooltips are triggered by clicking and they will show the contents of the title attribute of the element being clicked.
You can configure tooltips to set their preferred positions as well when they will appear. This tooltipis configured to preferably appear in the top middle, but won't appear there if there isn't enough space.
This tooltip's content is loaded by Ajax on hover and this one's loaded by Ajax too, but on click.
Even images can have tooltips. Click on the image below to show a tooltip.