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<!DOCTYPE html> <html> <body> <img src="planets.gif" width="145" height="126" usemap="#planetmap"> <map name="planetmap"> <area id="venus" target="_blank" shape="circle" coords="124,58,8" alt="Venus" href="../../www.example.com:80/test.htm"> </map> <p>Click the button to change the port number of the href attribute for the "venus" area in the image-map.</p> <p><b>Tip:</b> Open the "venus" area and look in the address bar before and after you have clicked the "Try it" button (the new example link is just a demonstration, and will not work).</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("venus").port = "443"; document.getElementById("demo").innerHTML = "The port number was changed from '80' to '443'."; } </script> </body> </html>