chromium/third_party/blink/web_tests/fast/events/context-onmousedown-event.html

<html>
<body>
<div id="box" onmousedown="document.getElementById('result').appendChild(document.createTextNode('PASS'));" style="border:1px dotted red">This tests to make sure that right clicking also sends a onmousedown event.</div>
<p id='result'></p>
</body>
</html>


<script>
if (window.testRunner) {
     var box, x, y;
     box = document.getElementById("box");
     x = box.offsetParent.offsetLeft + box.offsetLeft + box.offsetWidth / 2;
     y = box.offsetParent.offsetTop + box.offsetTop + box.offsetHeight / 2;
     eventSender.mouseMoveTo(x, y);
     eventSender.contextClick();
     testRunner.dumpAsText();
}

</script>