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<!DOCTYPE html> <html> <body> <img src="planets.gif" width="145" height="126" alt="Planets" usemap="#planetmap"> <map id="planetmap" name="planetmap"> <area shape="rect" coords="0,0,82,126" alt="Sun" href="sun.htm"> <area shape="circle" coords="90,58,3" alt="Mercury" href="mercur.htm"> <area shape="circle" coords="124,58,8" alt="Venus" href="venus.htm"> </map> <p>Click the button to get the number of area elements in the image-map.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("planetmap").areas.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>