<!doctype html>
<html>
  <head>
    <title>img ismap attribute coordinate origin</title>
    <style>
    #bg { background-color: lightgray; position: relative; }
    #target { position: absolute; width: 96px; height: 96px; border: 2px dashed green; pointer-events: none; }
    .before { top: 50px; left: 50px; }
    img { margin: 50px; border: 50px solid white; padding: 50px; }
    </style>
  </head>
  <body>
    <div id="bg">
      <div id="target" class="before"></div>
      <a href="/somewhere/">
        <