module/Customize/src/Grid/Customize/Model/Rule/Structure.php
protected function setBackgroundPositionProperty( $value, $priority = self::PRIORITY_NORMAL )
    {
        $parts = preg_split( '/\s+/', trim( $value ), 2 );
        $this->setRawProperty( 'background-position', $value, $priority );

        if ( count( $parts ) < 2 )
        {
            return $this;
        }

        list( $x, $y ) = $parts;
        return $this->setRawProperty( 'background-position-x', $x, $priority )
                    ->setRawProperty( 'background-position-y', $y, $priority );
    }
protected function setBackgroundPositionProperty( $value, $priority = self::PRIORITY_NORMAL )
    {
        $parts = preg_split( '/\s+/', trim( $value ), 2 );
        $this->setRawProperty( 'background-position', $value, $priority );

        if ( count( $parts ) < 2 )
        {
            return $this;
        }

        list( $x, $y ) = $parts;
        return $this->setRawProperty( 'background-position-x', $x, $priority )
                    ->setRawProperty( 'background-position-y', $y, $priority );
    }
protected function setBackgroundPositionProperty ( $ value , $ priority = self :: PRIORITY_NORMAL ) { $ parts = preg_split ( '/\s+/' , trim ( $ value ) , 2 ) ; $ this -> setRawProperty ( 'background-position' , $ value , $ priority ) ; if ( count ( $ parts ) < 2 ) { return $ this ; } list ( $ x , $ y ) = $ parts ; return $ this -> setRawProperty ( 'background-position-x' , $ x , $ priority ) -> setRawProperty ( 'background-position-y' , $ y , $ priority ) ; }
Set background-position

@param string $value
@param string $priority
@return \Customize\Model\Rule\Structure
Set background - position