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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="dummy"></div>
</body>
</html>
 
var count = 0
function clicked() {
  count++;
  if (count > 1) {
    alert("FAIL!");
  }
}
window.onload = function () {
  var el = document.getElementById('dummy');
  el.addEventListener('click', clicked, {once: true});
  el.click();
  el.click();
  if (count === 1) {
    alert('PASS.');
  }
};
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cvrebertpro
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