Add the previous set of elements on the stack to the current set.
Register a handler to be called when the first Ajax request begins. This is an Ajax Event.
Register a handler to be called when all Ajax requests have completed. This is an Ajax Event.
Determine if the callbacks list has been disabled.
Reject a Deferred object and call any failCallbacks with the given args.
Resolve a Deferred object and call any doneCallbacks with the given args.
Call the progressCallbacks on a Deferred object with the given args.
Determine whether the argument is a window.
Selects all elements with the given class.
Remove from the queue all items that have not yet been run.