old_contents: function tester(idList, test, description) {
      "use strict";
  
      var color = "";
      var index = 0;
      var li = document.createElement("li");
      var list = document.getElementById(idList);
      var result = "";
  
      index = list.childElementCount + 1;
      if (test) {
          color = "green";
          result = "<b>" + index + ". </b>" + description;
  
      } else {
          color = "red";
          description = "<s>" + description + "</s>";
          result = "<b>" + index + ". </b>" + description;
      }
      li.style.margin = "8px";
      li.style.padding = "2px";
      li.style.color = color;
      li.innerHTML = result;
      list.insertBefore(li, list.childNodes[0]);
  }
  
new_contents: function tester(test, description, idList) {
      "use strict";
  
      idList = idList || 'testList';
      var color = "";
      var index = 0;
      var li = document.createElement("li");
      var list = document.getElementById(idList);
      var result = "";
  
      index = list.childElementCount + 1;
      if (test) {
          color = "green";
  
      } else {
          color = "red";
          description = "<s>" + description + "</s>";
      }
      li.style.margin = "8px";
      li.style.padding = "2px";
      li.style.color = color;
      result = "<b>[" + index + "] </b>" + description;
      li.innerHTML = result;
      list.appendChild(li);
  }
  
subject: Update tester-function.js