Provides a render element for a group of form elements.
Usage example:
$form['author'] = array(
'#type' => 'fieldset',
'#title' => $this->t('Author'),
);
$form['author']['name'] = array(
'#type' => 'textfield',
'#title' => $this->t('Name'),
);
Plugin annotation
@RenderElement("fieldset")
Hierarchy
class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterfaceclass \Drupal\Core\Plugin\PluginBase uses DependencySerializat