text: window.addEventListener('DOMContentLoaded', load);
  
  function load() {
      var bodyTag = document.getElementsByTagName('body')[0];
      var toolTipTag = document.getElementById('tool-tip');
      var x_coords = 0, y_coords = 0;
      bodyTag.addEventListener('mousemove', function(e) {
          x_coords = e.clientX;
          y_coords = e.clientY;
          toolTipTag.style.left = x_coords + "px";
          toolTipTag.style.top = y_coords + "px";
          toolTipTag.innerHTML = x_coords + ", " + y_coords;
      });
  }