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<!DOCTYPE html> <html> <body> <img src="planets.gif" width="145" height="126" usemap="#planetmap"> <map name="planetmap"> <area id="venus" shape="circle" coords="124,58,8" alt="A beautiful planet" href="venus.htm"> </map> <p>Click the button to change the alternate text of the "venus" area in the image-map.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("venus").alt = "The planet Venus"; document.getElementById("demo").innerHTML = "The value of the alt attribute was changed from 'A beautiful planet' to 'The planet Venus'."; } </script> </body> </html>
