visible selector
Description: Selects all elements that are visible.
version added: 1.0jQuery( ":visible" )
Elements are considered visible if they consume space in the document. Visible elements have a width or height that is greater than zero.
Elements with visibility: hidden or opacity: 0 are considered visible, since they still consume space in the layout.
Elements that are not in a document are considered hidden; jQuery does not have a way to know if they will
