diff --git a/js/h5p-resizer.js b/js/h5p-resizer.js
index 228cc72..772cafd 100644
--- a/js/h5p-resizer.js
+++ b/js/h5p-resizer.js
@@ -19,7 +19,6 @@
   actionHandlers.hello = function (iframe, data, respond) {
     // Make iframe responsive
     iframe.style.width = '100%';
-    iframe.contentDocument.body.style.height = 'auto';
 
     // Tell iframe that it needs to resize when our window resizes
     var resize = function (event) {
@@ -47,7 +46,14 @@
    * @param {Function} respond Send a response to the iframe
    */
   actionHandlers.prepareResize = function (iframe, data, respond) {
-    respond('resizePrepared');
+    // Do not resize unless page and scrolling differs
+    if (iframe.clientHeight !== data.scrollHeight ||
+        data.scrollHeight !== data.clientHeight) {
+
+      // Reset iframe height, in case content has shrinked.
+      iframe.style.height = data.clientHeight + 'px';
+      respond('resizePrepared');
+    }
   };
 
   /**
@@ -59,16 +65,8 @@
    * @param {Function} respond Send a response to the iframe
    */
   actionHandlers.resize = function (iframe, data, respond) {
-    if (iframe.clientHeight === iframe.contentDocument.body.scrollHeight &&
-        iframe.contentDocument.body.scrollHeight === iframe.contentWindow.document.body.clientHeight) {
-      return; // Do not resize unless page and scrolling differs
-    }
-
-    // Reset iframe height, in case content has shrinked.
-    iframe.style.height = iframe.contentWindow.document.body.clientHeight + 'px';
-
     // Resize iframe so all content is visible. Use scrollHeight to make sure we get everything
-    iframe.style.height = iframe.contentDocument.body.scrollHeight + 'px';
+    iframe.style.height = data.scrollHeight + 'px';
   };
 
   /**
diff --git a/js/h5p-x-api.js b/js/h5p-x-api.js
index 6becdad..1cf8b74 100644
--- a/js/h5p-x-api.js
+++ b/js/h5p-x-api.js
@@ -95,7 +95,8 @@ H5P.EventDispatcher.prototype.triggerXAPIScored = function (score, maxScore, ver
 H5P.EventDispatcher.prototype.setActivityStarted = function() {
   if (this.activityStartTime === undefined) {
     // Don't trigger xAPI events in the editor
-    if (H5PIntegration.contents !== undefined &&
+    if (this.contentId !== undefined &&
+        H5PIntegration.contents !== undefined &&
         H5PIntegration.contents['cid-' + this.contentId] !== undefined) {
       this.triggerXAPI('attempted');
     }
diff --git a/js/h5p.js b/js/h5p.js
index 24d9846..934d8f6 100644
--- a/js/h5p.js
+++ b/js/h5p.js
@@ -279,6 +279,9 @@ H5P.init = function (target) {
           // Initial setup/handshake is done
           parentIsFriendly = true;
 
+          // Make iframe responsive
+          document.body.style.height = 'auto';
+
           // Hide scrollbars for correct size
           document.body.style.overflow = 'hidden';
 
@@ -289,7 +292,7 @@ H5P.init = function (target) {
         // When resize has been prepared tell parent window to resize
         H5P.communicator.on('resizePrepared', function (data) {
           H5P.communicator.send('resize', {
-            height: document.body.scrollHeight
+            scrollHeight: document.body.scrollHeight
           });
         });
 
@@ -307,7 +310,10 @@ H5P.init = function (target) {
           resizeDelay = setTimeout(function () {
             // Only resize if the iframe can be resized
             if (parentIsFriendly) {
-              H5P.communicator.send('prepareResize');
+              H5P.communicator.send('prepareResize', {
+                scrollHeight: document.body.scrollHeight,
+                clientHeight: document.body.clientHeight
+              });
             }
             else {
               H5P.communicator.send('hello');
@@ -1947,20 +1953,35 @@ H5P.createTitle = function (rawTitle, maxLength) {
     }
 
     if (H5PIntegration.saveFreq !== false) {
+      // When was the last state stored
+      var lastStoredOn = 0;
       // Store the current state of the H5P when leaving the page.
-      H5P.$window.on('beforeunload', function () {
-        for (var i = 0; i < H5P.instances.length; i++) {
-          var instance = H5P.instances[i];
-          if (instance.getCurrentState instanceof Function ||
-              typeof instance.getCurrentState === 'function') {
-            var state = instance.getCurrentState();
-            if (state !== undefined) {
-              // Async is not used to prevent the request from being cancelled.
-              H5P.setUserData(instance.contentId, 'state', state, {deleteOnChange: true, async: false});
+      var storeCurrentState = function () {
+        // Make sure at least 250 ms has passed since last save
+        var currentTime = new Date().getTime();
+        if (currentTime - lastStoredOn > 250) {
+          lastStoredOn = currentTime;
+          for (var i = 0; i < H5P.instances.length; i++) {
+            var instance = H5P.instances[i];
+            if (instance.getCurrentState instanceof Function ||
+                typeof instance.getCurrentState === 'function') {
+              var state = instance.getCurrentState();
+              if (state !== undefined) {
+                // Async is not used to prevent the request from being cancelled.
+                H5P.setUserData(instance.contentId, 'state', state, {deleteOnChange: true, async: false});
+              }
             }
           }
         }
+      };
+      // iPad does not support beforeunload, therefore using unload
+      H5P.$window.one('beforeunload unload', function () {
+        // Only want to do this once
+        H5P.$window.off('pagehide beforeunload unload');
+        storeCurrentState();
       });
+      // pagehide is used on iPad when tabs are switched
+      H5P.$window.on('pagehide', storeCurrentState);
     }
 
     /**