Semantic MediaWiki
To create tooltips in your wiki, you can simply use the info function that is included in Semantic MediaWiki.
This is a tooltip.
Tooltip Extension
There is an extension [1] that allows you to add tooltips via tag or parser function.
Using the tag like this
<tooltip text="body text" x=xoffset y=yoffset>tooltip text</tooltip>
produces ?UNIQab115884f90c6e0b-tooltip-00000005-QINU? errors
Trying the template and parser function approach produces fatal errors because methods in the Parser class have changed.
base text