I replicated the example of this site:
http://jqueryui.com/tooltip/#default
Html:
<h3 title='this is the title of hello world'>hello world</h3>
JS:
$(document).ready(function() {
$(document).tooltip();
});
But it’s still shows the regular tooltip only.
JSFiddle with added CSS resource:
http://jsfiddle.net/HjPtJ/
As you can read here http://api.jqueryui.com/tooltip/ the tooltip widget is added in jQuery UI version 1.9, the JSFiddle has jQuery UI 1.8 added.