Example for Checkpoint
9.1 - Provide client-side image maps instead of server-side image maps except where the regions cannot be defined with an available geometric shape.

The purpose of this checkpoint, in the context of device-independence, is to remind us that client-side image maps can (and must) use the alt attributes on the AREA elements to let the user know the purpose (destination) of each active area. Server side image maps cannot, in most circumstances, provide the user with similar information. If you must use a server side image map, you must provide an alternative way for users to navigate the links hidden in the image map.

Server side image maps are still important for applications like geographical information systems and mapping applications where each point (coordinate pair) is active. Designing a client side map with thousands of single pixel active regions would be very difficult.

To Checkpoints for Guideline 9.