The "coords" attribute of the <area shape="poly"> tag is missing the last "y" coordinate (the correct format is "x1,y1,x2,y2 …").
<area shape="poly"> 标签的 "coords" 属性缺少最后的 "y" 座标值 （正确格式为 "x1,y1,x2,y2 …"）。