Selects all input elements of type text. $( ":text" ) allows us to select all <input

Selects the element that is the root of the document. In HTML, the root of the document, and thus

Selects all input, textarea, select and button elements. The :input selector basically

Selects all elements of type checkbox. $( ":checkbox" ) is equivalent to $( "[type=checkbox]"

Selects all elements of type reset. :reset is equivalent to [type="reset"]

Selects all elements of the specified language. The :lang() selector matches elements

Selects all elements that are the first child of their parent. While

Selects all elements that are the nth-child of their parent. Because jQuery's implementation of

Selects all elements of type radio. $( ":radio" ) is equivalent to $( "[type=radio]"

Selects all elements that are descendants of a given ancestor. A descendant of an element could