.is()

Check the current matched set of elements against a selector, element, or jQuery object and return true if at least one of these elements matches the given arguments.

jQuery.speed

Creates an object containing a set of properties ready to be used in the definition of custom animations.

jQuery.when()

Provides a way to execute callback functions based on zero or more Thenable objects, usually Deferred objects that represent asynchronous events.

.find()

Get the descendants of each element in the current set of matched elements, filtered by a selector, jQuery object, or element.