Fix #474 (#488)
Fix #474 (#488)


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