JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<div class="im-the-dialog">
    <div class="60% width">some content</div>
    <div>
        <ul>
            <li>
                <a class="clicked">click</a>
            </li>
        </ul>
    </div>
    <div class="the context menu">some links</div>
</div>

JavaScript

$("a").on("click", function(eve){
	var t = $(this).offset();
  $("#contextmenu").show().css({
     left: eve.pageX,
     top: eve.pageY
  });
  var left = eve.pageX- t.left;
  var right = eve.pageY- t.top;
  alert(left + " " +right );
});