anchor.diff:        function reportError(msg) {
           function handleReady() {
             if (this.readyState == this.DONE && this.status != 200) {
  -            // We could not report, pop up to notify if running interactively.
  -            alert(this.status);
  +            var error = 'Sending back error did not succeeed: ' + this.status;
  +            error = error + '. Failed to send msg: ' + msg;
  +            error_div.innerHTML = error;
             }
           }
           contactBrowserController(
  
positive.code: 
        function run(url) {
          number_of_tests++;
          document.getElementById('number').innerHTML = number_of_tests;
          if (use_iframe) {
            embedded_iframe.src = url;
          } else {
  
negative.code:       var testing_window;
  
        var embedded_iframe = document.getElementById('embedded_iframe');
        var number_div = document.getElementById('number');
        var executing_div = document.getElementById('currently_executing');
        var error_div = document.getElementById('unhandled_error');
        var use_iframe = ${useIframe};
        var start = new Date();
  
  