diff --git a/classes/class-handler.php b/classes/class-handler.php
index b6005e9..3002b5d 100644
--- a/classes/class-handler.php
+++ b/classes/class-handler.php
@@ -263,6 +263,8 @@ public function get_kses_for_allowed_blocks( array $tags ) {
 		$tags['mark'] = [ 'class' => true ];
 		$tags['sub'] = [];
 		$tags['sup'] = [];
+		$tags['span'] = [ 'style' => true ];
+		$tags['bdo'] = [ 'lang' => true, 'dir' => true ];
 
 		return $tags;
 	}