text: <?php
  
  namespace Facebook\WebDriver\Interactions\Internal;
  
  use Facebook\WebDriver\WebDriverAction;
  
  class WebDriverKeyUpAction extends WebDriverSingleKeyAction implements WebDriverAction
  {
      public function perform()
      {
          $this->focusOnElement();
          $this->keyboard->releaseKey($this->key);
      }
  }
  