.css()

Get the value of a computed style property for the first element in the set of matched elements or set one or more CSS properties for every matched element.

.prevAll()

Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector, in the reverse document order.

.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.

.closest()

For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.