manually apply #81
manually apply #81

file:a/index.html -> file:b/index.html
--- a/index.html
+++ b/index.html
@@ -82,6 +82,8 @@
     </p>
   </div>
 
+  <script src="js/bind_polyfill.js"></script>
+  <script src="js/classlist_polyfill.js"></script>
   <script src="js/animframe_polyfill.js"></script>
   <script src="js/keyboard_input_manager.js"></script>
   <script src="js/html_actuator.js"></script>

--- /dev/null
+++ b/js/bind_polyfill.js
@@ -1,1 +1,10 @@
+Function.prototype.bind = Function.prototype.bind || function (target) {
+  var self = this;
+  return function (args) {
+    if (!(args instanceof Array)) {
+      args = [args];
+    }
+    self.apply(target, args);
+  };
+};
 

--- /dev/null
+++ b/js/classlist_polyfill.js
@@ -1,1 +1,72 @@
+(function () {
+  if (typeof window.Element === "undefined" ||
+      "classList" in document.documentElement) {
+    return;
+  }
 
+  var prototype = Array.prototype,
+      push = prototype.push,
+      splice = prototype.splice,
+      join = prototype.join;
+
+  function DOMTokenList(el) {
+    this.el = el;
+    // The className needs to be trimmed and split on whitespace
+    // to retrieve a list of classes.
+    var classes = el.className.replace(/^\s+|\s+$/g, '').split(/\s+/);
+    for (var i = 0; i < classes.length; i++) {
+      push.call(this, classes[i]);
+    }
+  }
+
+  DOMTokenList.prototype = {
+    add: function (token) {
+      if (this.contains(token)) return;
+      push.call(this, token);
+      this.el.className = this.toString();
+    },
+    contains: function (token) {
+      return this.el.className.indexOf(token) != -1;
+    },
+    item: function (index) {
+      return this[index] || null;
+    },
+    remove: function (token) {
+      if (!this.contains(token)) return;
+      for (var i = 0; i < this.length; i++) {
+        if (this[i] == token) break;
+      }
+      splice.call(this, i, 1);
+      this.el.className = this.toString();
+    },
+    toString: function () {
+      return join.call(this, ' ');
+    },
+    toggle: function (token) {
+      if (!this.contains(token)) {
+        this.add(token);
+      } else {
+        this.remove(token);
+      }
+
+      return this.contains(token);
+    }
+  };
+
+  window.DOMTokenList = DOMTokenList;
+
+  function defineElementGetter(obj, prop, getter) {
+    if (Object.defineProperty) {
+      Object.defineProperty(obj, prop, {
+        get: getter
+      });
+    } else {
+      obj.__defineGetter__(prop, getter);
+    }
+  }
+
+  defineElementGetter(HTMLElement.prototype, 'classList', function () {
+    return new DOMTokenList(this);
+  });
+})();
+

--- a/js/game_manager.js
+++ b/js/game_manager.js
@@ -16,14 +16,14 @@
 // Restart the game
 GameManager.prototype.restart = function () {
   this.storageManager.clearGameState();
-  this.actuator.continue(); // Clear the game won/lost message
+  this.actuator.continueGame(); // Clear the game won/lost message
   this.setup();
 };
 
 // Keep playing after winning (allows going over 2048)
 GameManager.prototype.keepPlaying = function () {
   this.keepPlaying = true;
-  this.actuator.continue(); // Clear the game won/lost message
+  this.actuator.continueGame(); // Clear the game won/lost message
 };
 
 // Return true if the game is lost, or has won and the user hasn't kept playing

--- a/js/html_actuator.js
+++ b/js/html_actuator.js
@@ -36,7 +36,7 @@
 };
 
 // Continues the game (both restart and keep playing)
-HTMLActuator.prototype.continue = function () {
+HTMLActuator.prototype.continueGame = function () {
   this.clearMessage();
 };
 

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