You can see it on the official demo pages -->
http://jqueryui.com/demos/datepicker/If you look at the bottom of the body (I use Firebug) you can see the
ui-datepicker-div there and that it's not in fact hidden. In most
cases (I didn't notice it until just recently) this won't be an issue
at all since you can't normally see it but I stumbled upon it in a
weird 100% height layout. It the whole dialog isn't showing but
padding (or margin) was, causing a scrollbar to appear where it
shouldn't. It was easy to fix by hiding the div after init but it
should seem like this would be the default behaviour. After you click
the input and then close the dialog it will be hidden, just like it
should be from start.