The port
property sets or gets the port of the href attribute value.
Change the port number of the URL for a specific area in an image-map:
document.getElementById("myArea").port = "443";
Click the button to change the port number of the href attribute for the myArea
area in the image-map.
<!DOCTYPE html> <html> <body> <img src="image1.png" width="100" height="100" usemap="#myFlagMap"> <map name="myFlagMap"> <area id="myArea" target="_blank" shape="circle" coords="50,50,40" alt="Target" href="http://www.example.com:80/test.htm"> </map>//from w ww . j a va 2 s . co m <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myArea").port = "8080"; document.getElementById("demo").innerHTML = "The port number was changed."; } </script> </body> </html>