NEEDs jquery.js and jquery.dimensions.js
    * http://jquery.com/ - jQuery
    * http://brandonaaron.net/docs/dimensions/ - jQuery Dimensions Plugin 1.1


<script type="text/javascript">
// <![CDATA[
$(document).ready(function() {
  $("*").bind("click",
              function(){
                  var info = $(this).position();
                  info["height"] = $(this).height();
                  info["width"] = $(this).width();
                  info["lineage"] = $(this).parents()
                             .map(function () {
                                   return this.tagName;
                                  })
                             .get().reverse().join(" + ");
                  $.ajax({url:"/cgi/position.pl"
                         ,data:info
                         ,dataType:"json"
                         ,type:"POST"
                         ,success: function(data){
                            $("#tag").append(data.status + " ")
                          }
                        });
               });
});
// ]]>
</script>


##</code><code>##

height  19
left    199
lineage HTML + BODY + DIV + UL
top     74
width   648


##</code><code>##

use strict;
use warnings;
use CGI qw(:standard);
use JSON::XS;

if ( request_method() eq "GET" )
{
    print
        header(-content_type => "text/html; charset=utf-8"),
            "This is not a human readable resource.";
}
elsif ( request_method() eq "POST" )
{
    # Open a file to save the POSTed info here!
    # Perhaps handle errors to return to Ajax.
    print
        header(-content_type => "application/json; charset=utf-8"),
            to_json( { status => "OK" } );
}