Reference

| select  | when the user makes a text selection inside it. 
| focus   | gains focus
| blur    | lose focus
| find    | get the descendants of each element in the 
          | current set of matched elements, filtered by a  
          | selector, jQuery object, or element.
| clone   | create a deep copy of the set of matched elements.
| closest | get the first element that matches the selector by 
          | testing the element itself and traversing up through 
          | its ancestors in the DOM tree.
| extend  | merge the contents of two or more objects into first object
          | the property of first object will be overwritten by a 
          | property in second object.