php/widgets/ButtonWidget.php
public function setNoFollow( $noFollow ) {
		$this->noFollow = is_bool( $noFollow ) ? $noFollow : true;

		if ( $this->noFollow ) {
			$this->button->setAttributes( [ 'rel' => 'nofollow' ] );
		} else {
			$this->button->removeAttributes( [ 'rel' ] );
		}

		return $this;
	}
public function setNoFollow( $noFollow ) {
		$this->noFollow = is_bool( $noFollow ) ? $noFollow : true;

		if ( $this->noFollow ) {
			$this->button->setAttributes( [ 'rel' => 'nofollow' ] );
		} else {
			$this->button->removeAttributes( [ 'rel' ] );
		}

		return $this;
	}
public function setNoFollow ( $ noFollow ) { $ this -> noFollow = is_bool ( $ noFollow ) ? $ noFollow : true ; if ( $ this -> noFollow ) { $ this -> button -> setAttributes ( [ 'rel' => 'nofollow' ] ) ; } else { $ this -> button -> removeAttributes ( [ 'rel' ] ) ; } return $ this ; }
Set search engine traversal hint.

@param bool $noFollow True if search engines should avoid traversing this hyperlink
@return $this
Set search engine traversal hint .