<html>
<body>
<img src="/img/eg_planets.jpg"
usemap="#planetmap" />
<map name="planetmap">
<area id="venus" shape="circle"
coords="180,139,14"
alt="Venus"
href="/example/hdom/venus.html" />
</map>
<p>Venus area 的 shape 属性是：
<script type="text/javascript">
x=document.getElementById("venus");
document.write(x.shape);
</script>
</p>
</body>
</html>