This is a non-production site

ConfirmFormInterface

class \Drupal\Core\Entity\ContentEntityConfirmFormBase extends \Drupal\Core\Form\ConfirmFormInterface implements \Drupal\Core\Entity\ContentEntityForm
class \Drupal\Core\Entity\ContentEntityDeleteForm uses \Drupal\Core\Entity\EntityDeleteFormTrait implements \Drupal\Core\Entity\ContentEntityConfirmFormBase
class \Drupal\Core\Entity\EntityConfirmFormBase extends \Drupal\Core\Form\ConfirmFormInterface implements \Drupal\Core\Entity\EntityForm
class \Drupal\Core\Entity\EntityDeleteForm uses \Drupal\Core\Entity\EntityDeleteFormTrait implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\Core\Entity\Form\DeleteMultipleForm extends \Drupal\Core\Form\BaseFormIdInterface, \Drupal\Core\Form\WorkspaceDynamicSafeFormInterface uses \Drupal\Core\Entity\Form\WorkspaceSafeFormTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\Core\Entity\Form\RevisionDeleteForm extends \Drupal\Core\Entity\EntityFormInterface implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\Core\Entity\Form\RevisionRevertForm extends \Drupal\Core\Entity\EntityFormInterface implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\Core\Form\ConfirmFormBase extends \Drupal\Core\Form\ConfirmFormInterface implements \Drupal\Core\Form\FormBase
class \Drupal\action\Form\ActionDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\action_bulk_test\Form\TestActionConfirmForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\ban\Form\BanDelete implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\block\Form\BlockDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\block_content\Form\BlockContentDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\block_content\Form\BlockContentTypeDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\book\Form\BookRemoveForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\comment\Form\CommentTypeDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\comment\Form\ConfirmDeleteMultiple implements \Drupal\Core\Entity\Form\DeleteMultipleForm
class \Drupal\comment\Form\DeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\config\Form\ConfigSingleImportForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\config_entity_example\Form\RobotDeleteForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\config_translation\Form\ConfigTranslationDeleteForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\content_entity_example\Form\ContactDeleteForm implements \Drupal\Core\Entity\ContentEntityConfirmFormBase
class \Drupal\content_translation\Form\ContentTranslationDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\ctools\Form\ConditionDelete implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\ctools\Form\ContextDelete implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\ctools\Form\RequiredContextDelete implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\ctools\Form\ResolverRelationshipDelete implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\ctools_wizard_test\Form\ExampleConfigEntityDeleteForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\dblog\Form\DblogClearLogConfirmForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\devel\Form\ConfigDeleteForm extends \Drupal\Core\Form\ConfirmFormInterface implements \Drupal\Core\Form\FormBase
class \Drupal\devel\Form\RouterRebuildConfirmForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\entity_test\EntityTestDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\field_ui\Form\EntityDisplayModeDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\field_ui\Form\FieldConfigDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\filter\Form\FilterDisableForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\form_test\ConfirmFormArrayPathTestForm implements \Drupal\form_test\ConfirmFormTestForm
class \Drupal\form_test\ConfirmFormTestForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\forum\Form\DeleteForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\image\Form\ImageEffectDeleteForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\image\Form\ImageStyleDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\image\Form\ImageStyleFlushForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\language\Form\LanguageDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\language\Form\NegotiationBrowserDeleteForm uses \Drupal\Core\Form\ConfigFormBaseTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\layout_builder\Form\DiscardLayoutChangesForm extends \Drupal\Core\Form\WorkspaceDynamicSafeFormInterface uses \Drupal\layout_builder\Form\WorkspaceSafeFormTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\layout_builder\Form\LayoutBuilderDisableForm extends \Drupal\Core\Form\WorkspaceDynamicSafeFormInterface uses \Drupal\layout_builder\Form\WorkspaceSafeFormTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\layout_builder\Form\LayoutRebuildConfirmFormBase extends \Drupal\Core\Form\WorkspaceDynamicSafeFormInterface uses \Drupal\Core\Ajax\AjaxFormHelperTrait, \Drupal\layout_builder\LayoutBuilderHighlightTrait, \Drupal\layout_builder\Controller\LayoutRebuildTrait, \Drupal\layout_builder\Form\WorkspaceSafeFormTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\layout_builder\Form\RemoveBlockForm implements \Drupal\layout_builder\Form\LayoutRebuildConfirmFormBase
class \Drupal\layout_builder\Form\RemoveSectionForm implements \Drupal\layout_builder\Form\LayoutRebuildConfirmFormBase
class \Drupal\layout_builder\Form\RevertOverridesForm extends \Drupal\Core\Form\WorkspaceDynamicSafeFormInterface uses \Drupal\layout_builder\Form\WorkspaceSafeFormTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\media\Form\MediaTypeDeleteConfirmForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\menu_link_content\Form\MenuLinkContentDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\menu_ui\Form\MenuDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\menu_ui\Form\MenuLinkResetForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\node\Form\DeleteMultiple implements \Drupal\Core\Entity\Form\DeleteMultipleForm
class \Drupal\node\Form\NodeDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\node\Form\NodeRevisionDeleteForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\node\Form\NodeRevisionRevertForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\node\Form\NodeRevisionRevertTranslationForm implements \Drupal\node\Form\NodeRevisionRevertForm
class \Drupal\node\Form\NodeTypeDeleteConfirm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\node\Form\RebuildPermissionsForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\rest_example\Form\RestExampleClientDelete implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\search\Form\ReindexConfirm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\shortcut\Form\ShortcutDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\shortcut\Form\ShortcutSetDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\system\Form\DateFormatDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\system\Form\ModulesListConfirmForm uses \Drupal\system\Form\ModulesEnabledTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\system\Form\ModulesListNonStableConfirmForm implements \Drupal\system\Form\ModulesListConfirmForm
class \Drupal\system\Form\ModulesUninstallConfirmForm uses \Drupal\Core\Config\Entity\ConfigDependencyDeleteFormTrait implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\system\Form\PrepareModulesEntityUninstallForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\system\Form\ThemeExperimentalConfirmForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\tabledrag_example\Form\TableDragExampleResetForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\taxonomy\Form\TermDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\taxonomy\Form\VocabularyDeleteForm implements \Drupal\Core\Entity\EntityDeleteForm
class \Drupal\taxonomy\Form\VocabularyResetForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\user\Form\UserCancelForm implements \Drupal\Core\Entity\ContentEntityConfirmFormBase
class \Drupal\user\Form\UserLogoutConfirm extends \Drupal\Core\Form\WorkspaceSafeFormInterface implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\user\Form\UserMultipleCancelConfirm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\views_ui\Form\BreakLockForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\workflows\Form\WorkflowDeleteForm implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\workflows\Form\WorkflowStateDeleteForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\workflows\Form\WorkflowTransitionDeleteForm implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\workspaces\Form\SwitchToLiveForm extends \Drupal\Core\DependencyInjection\ContainerInjectionInterface, \Drupal\Core\Form\WorkspaceSafeFormInterface implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\workspaces\Form\WorkspaceActivateForm extends \Drupal\Core\Form\WorkspaceSafeFormInterface implements \Drupal\Core\Entity\EntityConfirmFormBase
class \Drupal\workspaces\Form\WorkspaceDeleteForm implements \Drupal\Core\Entity\ContentEntityDeleteForm
class \Drupal\workspaces\Form\WorkspaceMergeForm extends \Drupal\Core\DependencyInjection\ContainerInjectionInterface, \Drupal\Core\Form\WorkspaceSafeFormInterface implements \Drupal\Core\Form\ConfirmFormBase
class \Drupal\workspaces\Form\WorkspacePublishForm extends \Drupal\Core\DependencyInjection\ContainerInjectionInterface, \Drupal\Core\Form\WorkspaceSafeFormInterface implements \Drupal\Core\Form\ConfirmFormBase

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.