public function down($x, $y)
    {
        $this->webDriver->getDriver()->curl(
            $this->webDriver->getDriver()->factoryCommand(
                'touch/down',
                WebDriver_Command::METHOD_POST,
                [
                    'x' => (int) $x,
                    'y' => (int) $y,
                ]
            )
        );
        return $this;
    }