set:leading() returns the nodes in one node-set that come before the first node in the other node-set.
- The node set to find nodes in that precede the first node in the second node set.
- The node set to compare against.
A node-set containing the nodes from
nodeSet1 whose values precede the first node in
nodeSet2isn't contained in
nodeSet1, an empty set is returned. If
nodeSet2is empty, then the result is
Supported in Gecko 1.9 and later.