The urns() method of areas is described in chapter: javascript all urns( )

Returns a collection of area objects (among all objects nested within the current collection) with tags that match the tagName parameter.

Returns a single area object or collection of area objects corresponding to the element matching the parameter string value.

Returns a single area object or collection of area objects corresponding to the element matching the index value (or, optionally in IE, the ind

Returns the number of elements in the collection of areas.

A collection of all area elements associated with a map element. Notice that individual items of an areas collection are also members of the