Expanded class hierarchy of ConfigExportForm
class ConfigExportForm implements FormInterface {
  public function getFormID() {
    return 'config_export_form';
  }
  public function buildForm(array $form, array &$form_state) {
    $form['#action'] = '/admin/config/development/export-download';
    $form['description'] = array(
      '#markup' => '<p>' . t('Use the export button below to download your site configuration.') . '</p>',
    );
    $form['submit'] = array(
      '#type' => 'submit',
      '#value' => t('Export'),
    );
    return $form;
  }
  public function validateForm(array &$form, array &$form_state) {
  }
  public function submitForm(array &$form, array &$form_state) {
  }
}| Name   | Modifiers | Type | Description | Overrides | 
|---|---|---|---|---|
| ConfigExportForm:: | public | function | Form constructor. Overrides FormInterface:: | |
| ConfigExportForm:: | public | function | Returns a unique string identifying the form. Overrides FormInterface:: | |
| ConfigExportForm:: | public | function | Form submission handler. Overrides FormInterface:: | |
| ConfigExportForm:: | public | function | Form validation handler. Overrides FormInterface:: |