谁能告诉我这个html编码的错误在哪里？
https://newmedia.leeds.ac.uk/ug10/cs10jy/portfolio/studenthands/imagemap.html
我已经写了这段代码，但在网上查看并遵循教程后，我似乎看不出哪里出错了......
<img src ="images/socialnetwork.png"
width="220" border="0"
usemap ="#socialmap" />
<map id ="socialmap"
name="socialmap">
<area shape ="poly" coords ="77,83,163,127"
href ="https://www.facebook.com/StudentHands" target="_blank" />
<area shape ="poly" coords ="1,105,75,153"
href ="https://twitter.com/StudentHands" target="_blank" />
</map>
任何帮助将非常感激！