         // Appending dialog to document.body to cover sidenav in docs app
          // Modal dialogs should fully cover application
          // to prevent interaction outside of dialog
          $mdDialog.show(
            $mdDialog.alert()
              .parent(angular.element(document.querySelector('#popupContainer')))
              .clickOutsideToClose(true)
              .title('This is an alert title')
              .content('You can specify some description text in here.')
              .ariaLabel('