<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="Venus" href="venus.html">
</map>
<p>Click the button to display the protocol of the href attribute for the "venus" area.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("venus").protocol;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
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</html>