This is a mechanism that allows the style engine in Netscape 4.0 to call for help when things get too complicated. Basically it calls the handler when an object is created and that handler sets the properties of the receiving object. There is an implied this on the front of any property names that are assigned with new values.
Deprecated for any further use. This was available only in Netscape 4.0 and is completely removed from Netscape 6.0