Expanded class hierarchy of Heading in Drupal 10
- class \Drupal\ckeditor5\Plugin\CKEditor5Plugin\Heading extends \Drupal\ckeditor5\Plugin\CKEditor5PluginDefault implements \Drupal\ckeditor5\Plugin\CKEditor5PluginConfigurableInterface, \Drupal\ckeditor5\Plugin\CKEditor5PluginElementsSubsetInterface uses \Drupal\ckeditor5\Plugin\CKEditor5PluginConfigurableTrait