HTML and CSS Reference
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Determining Your Coordinates
Client-side imagemaps consist of two parts; the first is the image used for the imagemap.
The second is the set of HTML tags used to define the regions of the imagemap that
serve as links. To define these tags, you must determine the exact coordinates on your
image that define the regions you'll use as links.
You can determine these coordinates either by sketching regions and manually noting the
coordinates or by using an imagemap creation program. The latter method is easier
because the program automatically generates a map file based on the regions you draw
with the mouse.