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Chapter 10. Image Maps

Technically, an image map is a map of screen coordinates that define regions, or hotspots, of a browser window. They are assigned to functions or links. An image map usually overlays a graphical image to give the user clues about the associated actions. (Actually, many people refer to the graphic itself as the image map.) Image maps are often used as navigational tools, as links to other sites or pages, or to draw attention to a particular concept of a web site.

An image map can be server-side, which means that it resides on the server and is downloaded as needed; or client-side, which means that it’s part of the web page’s HTML. Early versions of HTML supported only server-side image maps. Now, server-side is used only in certain cases for when control is required. Client-side image maps relieve some of the load on the server. In addition, because they are part of the web page, client-side image maps still work when browsing offline.


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