' . '' . __( 'Name', 'understrap' ) . ( $req ? ' *' : '' ) . ' ' . '

', 'email' => '

' . __( 'Email', 'understrap' ) . ( $req ? ' *' : '' ) . ' ' . '

', 'url' => '

' . __( 'Website', 'understrap' ) . ' ' . '

', ); return $fields; } add_filter( 'comment_form_defaults', 'bootstrap3_comment_form' ); function bootstrap3_comment_form( $args ) { $args['comment_field'] = '

' . _x( 'Comment', 'noun', 'understrap' ) . ( ' *' ) . '

'; $args['class_submit'] = 'btn btn-default'; // since WP 4.1 return $args; }