.promise()

Return a Promise object to observe when all actions of a certain type bound to the collection, queued or not, have finished.

.parentsUntil()

Get the ancestors of each element in the current set of matched elements, up to but not including the element matched by the selector, DOM node, or jQuery object.

callbacks.has()

Determine whether or not the list has any callbacks attached. If a callback is provided as an argument, determine whether it is in a list.

.finish()

Stop the currently-running animation, remove all queued animations, and complete all animations for the matched elements.