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

Returns a collection of cell objects (among all objects nested within the current collection) whose tags match the tagName parameter.

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

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

Returns the number of elements in the collection of cells.

A collection of all td elements contained within a single tr element. Collection members are sorted in source code order.