diff -u b/core/modules/system/templates/textarea.html.twig b/core/modules/system/templates/textarea.html.twig
--- b/core/modules/system/templates/textarea.html.twig
+++ b/core/modules/system/templates/textarea.html.twig
@@ -13,6 +13,4 @@
  * @ingroup themeable
  */
- @todo: remove this file once http://drupal.org/node/1819284 is resolved.
- This is identical to core/modules/system/templates/container.html.twig
 #}
 <div{{ wrapper_attributes }}><textarea{{ attributes }}>{{ value }}</textarea></div>