No area elements should open a new window without warning.

Example

Wrong

<map name="worldmap"> <area shape="rect" coords="0,0,82,126" href="north-america.htm" target="_blank" alt="North America"/> </map>

Right

<map name="worldmap"> <area shape="rect" coords="0,0,82,126" href="north-america.htm" target="_blank" alt="North America (opens a new window)"/> </map>