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chromium/chrome/test/data/download-anchor-script.html 

<html>
<head><title>Download Test for &lt;a download&gt;</title></head>
<body>
<a id='reddot1' href="anchor_download_test.png" download='red_dot1.png'>Download First Red Dot!</a>
<a id='reddot2' href="anchor_download_test.png" download='red_dot2.png'>Download Second Red Dot!</a>
<script>
function startDownload1() {
  var evt = document.createEvent("MouseEvent");
  evt.initMouseEvent('click', true, true);
  document.getElementById('reddot1').dispatchEvent(evt);
  return true;
}
function startDownload2() {
  var evt = document.createEvent("MouseEvent");
  evt.initMouseEvent('click', true, true);
  document.getElementById('reddot2').dispatchEvent(evt);
  return true;
}
</script>
</body>
</html>