// Locate, and traverse, all the elements in the DOM
  var all = document.getElementsByTagName(“*”);
  for ( var i = 0; i < all.length; i++ ) {
  
      // Watch for when the user moves his mouse over the element
      // and add a red border around the element
      all[i].onmouseover = function(e) {
          this.style.border = “1px solid red”;
          stopBubble( e );
      };
  
      // Watch for when the user moves back out of the element
      // and remove the border that we added
      all[i].onmouseout = function(e) {
          this.style.border = “0px”;
          stopBubble( e );
      };
  
  }