1 files changed, 9 insertions, 1 deletions
diff --git a/appinfo/application.php b/appinfo/application.php
index 22783ef87..b639ce39c 100644
--- a/appinfo/application.php
+++ b/appinfo/application.php
@@ -111,13 +111,21 @@ class Application extends App {
             }
 
             $config = HTMLPurifier_Config::createDefault();
-            $config->set('HTML.ForbiddenAttributes', 'class');
+
             $config->set('Cache.SerializerPath', $directory);
+            $config->set('HTML.ForbiddenAttributes', 'class');
+            $config->set('HTML.AllowedAttributes', '*.allowfullscreen');
             $config->set('HTML.SafeIframe', true);
             $config->set('URI.SafeIframeRegexp',
                 '%^https://(?:www\.)?(' .
                 'youtube(?:-nocookie)?.com/embed/|' .
                 'player.vimeo.com/video/)%'); //allow YouTube and Vimeo
+
+            $config->set('HTML.DefinitionID', 'News');
+            $config->set('HTML.DefinitionRev', 1);
+            $def = $config->getHTMLDefinition(true);
+            $def->addAttribute('iframe', 'allowfullscreen', 'Bool');
+
             return new HTMLPurifier($config);
         });