diff --git a/h5p.classes.php b/h5p.classes.php
index a6add6b..ae7d2f5 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -1539,7 +1539,7 @@ class H5PCore {
 
   public static $coreApi = array(
     'majorVersion' => 1,
-    'minorVersion' => 3
+    'minorVersion' => 4
   );
   public static $styles = array(
     'styles/h5p.css',
@@ -1547,6 +1547,7 @@ class H5PCore {
   public static $scripts = array(
     'js/jquery.js',
     'js/h5p.js',
+    'js/h5p-event-dispatcher.js',
   );
   public static $adminScripts = array(
     'js/jquery.js',
diff --git a/js/h5p-event-dispatcher.js b/js/h5p-event-dispatcher.js
new file mode 100644
index 0000000..fb7f5ef
--- /dev/null
+++ b/js/h5p-event-dispatcher.js
@@ -0,0 +1,152 @@
+/** @namespace H5P */
+var H5P = H5P || {};
+
+H5P.EventDispatcher = (function () {
+
+  /**
+   * The base of the event system.
+   * Inherit this class if you want your H5P to dispatch events.
+   * @class
+   */
+  function EventDispatcher() {
+    var self = this;
+
+    /**
+     * Keep track of events and listeners for each event.
+     * @private
+     * @type {Object}
+     */
+    var events = {};
+
+    /**
+     * Add new event listener.
+     *
+     * @public
+     * @throws {TypeError} listener must be a function
+     * @param {String} type Event type
+     * @param {Function} listener Event listener
+     */
+    self.on = function (type, listener) {
+      if (!(listener instanceof Function)) {
+        throw TypeError('listener must be a function');
+      }
+
+      // Trigger event before adding to avoid recursion
+      self.trigger('newListener', type, listener);
+
+      if (!events[type]) {
+        // First
+        events[type] = [listener];
+      }
+      else {
+        // Append
+        events[type].push(listener);
+      }
+    };
+
+    /**
+     * Add new event listener that will be fired only once.
+     *
+     * @public
+     * @throws {TypeError} listener must be a function
+     * @param {String} type Event type
+     * @param {Function} listener Event listener
+     */
+    self.once = function (type, listener) {
+      if (!(listener instanceof Function)) {
+        throw TypeError('listener must be a function');
+      }
+
+      var once = function () {
+        self.off(type, once);
+        listener.apply(self, arguments);
+      };
+
+      self.on(type, once);
+    };
+
+    /**
+     * Remove event listener.
+     * If no listener is specified, all listeners will be removed.
+     *
+     * @public
+     * @throws {TypeError} listener must be a function
+     * @param {String} type Event type
+     * @param {Function} [listener] Event listener
+     */
+    self.off = function (type, listener) {
+      if (listener !== undefined && !(listener instanceof Function)) {
+        throw TypeError('listener must be a function');
+      }
+
+      if (events[type] === undefined) {
+        return;
+      }
+
+      if (listener === undefined) {
+        // Remove all listeners
+        delete events[type];
+        self.trigger('removeListener', type);
+        return;
+      }
+
+      // Find specific listener
+      for (var i = 0; i < events[type].length; i++) {
+        if (events[type][i] === listener) {
+          events[type].unshift(i, 1);
+          self.trigger('removeListener', type, listener);
+          break;
+        }
+      }
+
+      // Clean up empty arrays
+      if (!events[type].length) {
+        delete events[type];
+      }
+    };
+
+    /**
+     * Creates a copy of the arguments list. Skips the given number of arguments.
+     *
+     * @private
+     * @param {Array} args List of arguments
+     * @param {Number} skip Number of arguments to skip
+     * @param {Array} Copy og arguments list
+     */
+    var getArgs = function (args, skip) {
+      var left = [];
+      for (var i = skip; i < args.length; i++) {
+        left.push(args[i]);
+      }
+      return left;
+    };
+
+    /**
+     * Dispatch event.
+     *
+     * @public
+     * @param {String} type Event type
+     * @param {...*} args
+     */
+    self.trigger = function (type) {
+      if (self.debug !== undefined) {
+        // Class has debug enabled. Log events.
+        console.log(self.debug + ' - Firing event "' + type + '", ' + (events[type] === undefined ? 0 : events[type].length) + ' listeners.', getArgs(arguments, 1));
+      }
+
+      if (events[type] === undefined) {
+        return;
+      }
+
+      // Copy all arguments except the first
+      var args = getArgs(arguments, 1);
+
+      // Call all listeners
+      for (var i = 0; i < events[type].length; i++) {
+        events[type][i].apply(self, args);
+      }
+    };
+  }
+
+  return EventDispatcher;
+})();
diff --git a/styles/h5p.css b/styles/h5p.css
index 1e94238..072ce4d 100644
--- a/styles/h5p.css
+++ b/styles/h5p.css
@@ -36,7 +36,9 @@ html.h5p-iframe .h5p-content {
   width: 100%;
   height: 100%;
 }
-.h5p-content.h5p-no-frame {
+.h5p-content.h5p-no-frame,
+.h5p-fullscreen .h5p-content,
+.h5p-semi-fullscreen .h5p-content {
   border: 0;
 }
 .h5p-container {