usemap 

usemap points to a map element which may be in this document
or an external document, although the latter is not widely supported

Attribute Information

Used By

Element img

Source 

<xs:attribute name="usemap" type="URI">
  <xs:annotation>
    <xs:documentation>usemap points to a map element which may be in this document or an external document, although the latter is not widely supported</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample