chromium/third_party/blink/web_tests/fast/events/controlclick-no-onclick.html

<html>
<body>
<div id="box" onclick="document.getElementById('result').innerHTML = 'FAIL';" style="border:1px dotted red">This tests to make sure that a control click does not result in a click event on the Mac.</div>
<p id='result'>PASS</p>
</body>
</html>

<script>
if (window.testRunner) {
  testRunner.dumpAsText();

  var isMacOSX = navigator.userAgent.indexOf("Mac OS X") != -1;
  if (isMacOSX) {
    var box = document.getElementById("box");
    var x = box.offsetParent.offsetLeft + box.offsetLeft + box.offsetWidth / 2;
    var y = box.offsetParent.offsetTop + box.offsetTop + box.offsetHeight / 2;
    eventSender.dragMode = false;
    eventSender.mouseMoveTo(x, y);
    eventSender.mouseDown(0, ['ctrlKey']);
    eventSender.mouseUp(0, ['ctrlKey']);
  }
}

</script>