Revert removal of todo
Revert removal of todo

andymutton/beta,webcomponents/webcomponents.org,andymutton/v2,customelements/v2,webcomponents/webcomponents.org,andymutton/beta,andymutton/v2,andymutton/beta,andymutton/v2,customelements/v2,customelements/v2,webcomponents/webcomponents.org,andymutton/v2,customelements/v2,andymutton/beta