Ticket #32093: 32093.diff

src/wp-includes/media.php

@@ -322 +322 @@
 
         $title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';
 
-        $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
+        $class = 'align' . esc_attr($align) .' attachment-' . esc_attr($size) . ' size-' . esc_attr($size) . ' wp-image-' . $id;
 
         /**
          * Filter the value of the attachment's image tag class attribute.