HTML and CSS Reference
In-Depth Information
function references that the browser executes when the event occurs.
[ JavaScript Event Handlers, 12.3.3 ]
For example, a popular, albeit simple, use of the onMouseOver event
is to print a more descriptive explanation in the browser's status box
whenever the user passes the mouse pointer over a region of the image
<area href=""
onMouseOver="self.status='A recipe for kumquat soup.';return true">
We should point out that the current versions of the popular browsers
automatically display the alt attribute's string value, ostensibly accom-
plishing the same task. So we recommend that you include the alt at-
tribute and value in lieu of hacking JavaScript. And, in context with a
text-based hyperlink, we argue that the contents of the tag itself should
explain the link. But images can be deceptive, so we urge you to take
advantage of both the alt attribute and event handlers to provide text
descriptions with your image maps. The shape attribute
Use the shape attribute to define the shape of an image map's mouse-
sensitive region: a circle ( circ or circle ), polygon ( poly or polygon ), or
rectangle ( rect or rectangle ).
The value of the shape attribute affects how the browser interprets the
value of the coords attribute. If you don't include a shape attribute, the
value default is assumed. According to the standard, default means
that the area covers the entire image. In practice, the browsers default
to a rectangular area and expect to find four coords values. If you don't
specify a shape and don't include four coordinates with the tag, the
browsers ignore the area altogether.
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