Text within NOBR can not be broken and ends up on a very very very loooooooooong line. A WBR tells netscape where a word can be broken if it needs to be. An example of its use is where a narrow band of text occurs between two pictures. With the release of Java, The push pull mechanism of netscape will have to be dismissed into the domains of the obsolete. This contains the other table tags.
Captions align to the top by default.
This defines a client side image map. The default url is normally set to be the current document. THe behaviour of the browser when overlapping areas are defined is not documented.