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

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

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

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

Returns the number of elements in the collection. It is 1 in most case, event there is no <tbody> tag.

This is a collection of all tbody elements contained within a single table element. Collection members are sorted in source code order.