<img src="/static/i/html/planets.gif" width="145" height="126" usemap="#planetmap">

<map name="planetmap">

<area id="venus" shape="circle" coords="124,58,8" alt="Venus" href="/static/media/html/venus.html">

</map>

<p>金星区域的 protocol:

<script>

document.write(document.getElementById('venus').protocol);

</script>

</p>

​