diff --git a/h5p.classes.php b/h5p.classes.php
index d07b8f7..d8e55a1 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -263,6 +263,7 @@ class H5PValidator {
     'w' => '/^[0-9]{1,4}$/',
     'h' => '/^[0-9]{1,4}$/',
     'embedTypes' => array('iframe', 'div'),
+    'fullscreen' => '/^(0|1)$/',
   );
 
   /**
diff --git a/js/h5p.js b/js/h5p.js
index 22db972..e082212 100644
--- a/js/h5p.js
+++ b/js/h5p.js
@@ -32,7 +32,7 @@ H5P.init = function () {
     var obj = new (H5P.classFromName($el.data('class')))(H5P.jQuery.parseJSON(H5PIntegration.getJsonContent(contentId)), contentId);
     obj.attach($el);
     
-    if (true/* fullscreen */) {
+    if (H5PIntegration.getFullscreen(contentId)) {
       H5P.jQuery('<div class="h5p-content-controls"><a href="#" class="h5p-enable-fullscreen">Enable fullscreen</a><div>').insertBefore($el).children().click(function () {
         H5P.fullScreen($el, obj);
         return false;