2.1.32 [HTML] Section 13.6.2, Server-side image maps
It is only possible to define a server-side image map for the IMG and INPUT elements.
All Document Modes (All Versions)
INPUT elements do not support client-side or server-side image maps. When usemap is used, or an A tag is used as a reference to a server-side map, the transactions are treated as a form submission to the current page.