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Title	Object type	File name	Summary
FormErrorHandlerInterface.php	file	core/lib/Drupal/Core/Form/FormErrorHandlerInterface.php
FormErrorHandlerInterface::handleFormErrors	function	core/lib/Drupal/Core/Form/FormErrorHandlerInterface.php	Handles form errors after form validation.
FormErrorHandlerTest	class	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php	@coversDefaultClass \Drupal\Core\Form\FormErrorHandler[[api-linebreak]] @group Form
FormErrorHandlerTest	class	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	@coversDefaultClass \Drupal\inline_form_errors\FormErrorHandler[[api-linebreak]] @group InlineFormErrors
FormErrorHandlerTest.php	file	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
FormErrorHandlerTest.php	file	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php
FormErrorHandlerTest::$formErrorHandler	property	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php	The form error handler.
FormErrorHandlerTest::$formErrorHandler	property	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	The form error handler.
FormErrorHandlerTest::$linkGenerator	property	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	The link generator.
FormErrorHandlerTest::$messenger	property	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	The messenger.
FormErrorHandlerTest::$messenger	property	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php	The messenger.
FormErrorHandlerTest::$renderer	property	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	The renderer.
FormErrorHandlerTest::$testForm	property	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	Form for testing.
FormErrorHandlerTest::setUp	function	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
FormErrorHandlerTest::setUp	function	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php
FormErrorHandlerTest::testDisplayErrorMessages	function	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php	@covers ::handleFormErrors[[api-linebreak]] @covers ::displayErrorMessages[[api-linebreak]]
FormErrorHandlerTest::testErrorMessagesInline	function	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	@covers ::handleFormErrors[[api-linebreak]] @covers ::displayErrorMessages[[api-linebreak]] @covers ::setElementErrorsFromFormState[[api-linebreak]]
FormErrorHandlerTest::testErrorMessagesNotInline	function	core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php	Tests that opting out of Inline Form Errors works.
FormErrorHandlerTest::testSetElementErrorsFromFormState	function	core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php	@covers ::handleFormErrors[[api-linebreak]] @covers ::setElementErrorsFromFormState[[api-linebreak]]
FormGroupingElementsTest	class	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php	Tests for form grouping elements.
FormGroupingElementsTest.php	file	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php
FormGroupingElementsTest::$defaultTheme	property	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php	The theme to install as the default for testing.
FormGroupingElementsTest::$modules	property	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php	Required modules.
FormGroupingElementsTest::setUp	function	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php
FormGroupingElementsTest::testDetailsChildVisibility	function	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php	Tests that details element children become visible.
FormGroupingElementsTest::testVerticalTabChildVisibility	function	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php	Tests that vertical tab children become visible.
FormGroupingElementsTest::testVerticalTabValidationVisibility	function	core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php	Confirms tabs containing a field with a validation error are open.
FormHelper	class	core/lib/Drupal/Core/Form/FormHelper.php	Provides helpers to operate on forms.
FormHelper.php	file	core/lib/Drupal/Core/Form/FormHelper.php
FormHelper::processStates	function	core/lib/Drupal/Core/Form/FormHelper.php	Adds JavaScript to change the state of an element based on another element.
FormHelper::processStatesArray	function	core/lib/Drupal/Core/Form/FormHelper.php	Helps recursively rewrite #states selectors.
FormHelper::rewriteStatesSelector	function	core/lib/Drupal/Core/Form/FormHelper.php	Rewrites #states selectors in a render element.
FormHelperTest	class	core/tests/Drupal/Tests/Core/Form/FormHelperTest.php	@coversDefaultClass \Drupal\Core\Form\FormHelper[[api-linebreak]] @group Form
FormHelperTest.php	file	core/tests/Drupal/Tests/Core/Form/FormHelperTest.php
FormHelperTest::providerElements	function	core/tests/Drupal/Tests/Core/Form/FormHelperTest.php	Provides a list of elements to test.
FormHelperTest::testProcessStates	function	core/tests/Drupal/Tests/Core/Form/FormHelperTest.php	@covers ::processStates[[api-linebreak]] @dataProvider providerElements
FormHelperTest::testRewriteStatesSelector	function	core/tests/Drupal/Tests/Core/Form/FormHelperTest.php	Tests rewriting the #states selectors.
FormInterface	interface	core/lib/Drupal/Core/Form/FormInterface.php	Provides an interface for a Form.
FormInterface.php	file	core/lib/Drupal/Core/Form/FormInterface.php
FormInterface::buildForm	function	core/lib/Drupal/Core/Form/FormInterface.php	Form constructor.
FormInterface::getFormId	function	core/lib/Drupal/Core/Form/FormInterface.php	Returns a unique string identifying the form.
FormInterface::submitForm	function	core/lib/Drupal/Core/Form/FormInterface.php	Form submission handler.
FormInterface::validateForm	function	core/lib/Drupal/Core/Form/FormInterface.php	Form validation handler.
FormJSAddMoreTest	class	core/modules/field/tests/src/FunctionalJavascript/FormJSAddMoreTest.php	Tests add more behavior for a multiple value field.
FormJSAddMoreTest.php	file	core/modules/field/tests/src/FunctionalJavascript/FormJSAddMoreTest.php
FormJSAddMoreTest::$defaultTheme	property	core/modules/field/tests/src/FunctionalJavascript/FormJSAddMoreTest.php	The theme to install as the default for testing.
FormJSAddMoreTest::$modules	property	core/modules/field/tests/src/FunctionalJavascript/FormJSAddMoreTest.php	Modules to enable.
FormJSAddMoreTest::setUp	function	core/modules/field/tests/src/FunctionalJavascript/FormJSAddMoreTest.php
FormJSAddMoreTest::testFieldFormJsAddMore	function	core/modules/field/tests/src/FunctionalJavascript/FormJSAddMoreTest.php	Tests the 'Add more' functionality.
FormModeAccessCheck	class	core/modules/field_ui/src/Access/FormModeAccessCheck.php	Defines an access check for entity form mode routes.

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