ismap

13.2 Including an image: the IMG element
...
Attributes defined elsewhere
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   * ismap, usemap (client side image maps)

    DD: misleading comments: ismap is server side image maps


13.6.2 Server-side image maps

Server-side image maps may be interesting in cases where the image map is
too complicated for a client-side image map.

It is only possible to define a server-side image map for the IMG and INPUT
elements. In the case of IMG, the IMG must be enclosed by an A element. In
the case of INPUT, the INPUT must be of type "image". In both cases, the
boolean attribute ismap [CI] on the element must be set.

   DD: INPUT doens't have ismap, it's always ISMAP.