Regarding the scroll option for the draggable constructor method I am puzzeled and would appreciate if someone can clarify it. From documentation: http://jqueryui.com/demos/draggable/#option-scroll 1-) Demo says that scroll refer to viewport: *Automatically scroll the document when the draggable is moved beyond the viewport.* and the code sample says it refer to the container: *If set to true, container auto-scrolls while dragging.* Is container the viewport? or the parent element of the draggable object? 2-) The default value for scroll is true. If I set scroll: false nothing happens! scroll is automatic as well. Finally, how does scroll works? Explanation and example, if possible, will be very appreciate and thaks a lot.