Expanded class hierarchy of AutocompleteWidget in Entity reference 8
- class \Drupal\entityreference\Plugin\field\widget\AutocompleteWidgetBase extends \Drupal\field\Plugin\Type\Widget\WidgetBase
- class \Drupal\entityreference\Plugin\field\widget\AutocompleteTagsWidget
- class \Drupal\entityreference\Plugin\field\widget\AutocompleteWidget