In HTML and XHTML, an image map is a list of coordinates relating to a specific image, created in order to hyperlink areas of the image to various destinations (as opposed to a normal image link, in which the entire area of the image links to a single destination). For example, a map of the world may have each country hyperlinked to further information about that country. The intention of an image map is to provide an easy way of linking various parts of an image without dividing the image into separate image files.

History[link]

Kevin Hughes invented the image map during January 1993^[1][2] while he was a student at Honolulu Community College (HCC).^[3]

Definition in HTML[link]

In HTML an imagemap is made of the actual image, that is embedded with the <img>-Tag. The image gets simultaneously the attribute usemap.

The imagemap comprise <map>-Tag and in the detail of the <area>-tags, which defines the fields with the weblinks. These are similar to the <a>-Tag defining which URL should be opened.

Following code defines a rectangular area (9,372,66,397) with a link to the English Wikipedia: <source lang="xml"> <img src="image.png" title="alternative text" usemap="#mapname" /> <map name="mapname">

 <area shape="rect" coords="9,372,66,397" href="http://en.wikipedia.org/" />

</map> </source>

Image maps use[link]

Image map example of The Club (Literary Club). Clicking on a person in the picture causes the browser to load the appropriate article.

It is possible to create image maps by hand using a text editor, but doing so requires web designers to know how to code HTML as well as how to enumerate the coordinates of the areas they wish to place over the image. As a result, most image maps coded by hand are simple polygons.

Because creating image maps in a text editor requires much time and effort, many applications have been designed to allow web designers to create image maps quickly and easily, much as they would create shapes in a vector graphics editor. Examples of these applications are Adobe's Dreamweaver or KImageMapEditor (for KDE), and the imagemap plugin found in GIMP.

Image maps which do not make their clickable areas obvious risk subjecting the user to mystery meat navigation. Even when they do, where they lead may not be obvious. This can be partially remedied with rollover effects.^[4]

References[link]