.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.

.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.

.map()

Pass each element in the current matched set through a function, producing a new jQuery object containing the return values.

jQuery.cssHooks

Hook directly into jQuery to override how particular CSS properties are retrieved or set, normalize CSS property naming, or create custom properties.