diff --git a/src/sammo/WebUtil.php b/src/sammo/WebUtil.php
index 2ceaab80..f1e2be7c 100644
--- a/src/sammo/WebUtil.php
+++ b/src/sammo/WebUtil.php
@@ -133,6 +133,9 @@ class WebUtil
         }
 
         $config = \HTMLPurifier_HTML5Config::createDefault();
+        $config->set('Filter.Custom', array (new \HTMLPurifier_Filter_YouTube()));
+        $config->set('HTML.SafeIframe', true);
+        $config->set('URI.SafeIframeRegexp', '%^(https?:)?//(www\.youtube(?:-nocookie)?\.com/embed/|player\.vimeo\.com/video/)%'); //allow YouTube and Vimeo
         $def = $config->getHTMLDefinition();
         $def->info_global_attr['data-flip'] = new \HTMLPurifier_AttrDef_Text;
         $purifier = new \HTMLPurifier($config);