22 methods override WidgetInterface::formElement()

BooleanCheckboxWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/BooleanCheckboxWidget.php
CommentWidget::formElement in core/modules/comment/src/Plugin/Field/FieldWidget/CommentWidget.php
DateTimeWidgetBase::formElement in core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeWidgetBase.php
DummyAjaxWidget::formElement in core/modules/image/tests/modules/image_module_test/src/Plugin/Field/FieldWidget/DummyAjaxWidget.php
EmailDefaultWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/EmailDefaultWidget.php
EntityReferenceAutocompleteWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/EntityReferenceAutocompleteWidget.php
FileWidget::formElement in core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php
LanguageSelectWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/LanguageSelectWidget.php
LayoutBuilderWidget::formElement in core/modules/layout_builder/src/Plugin/Field/FieldWidget/LayoutBuilderWidget.php
LinkWidget::formElement in core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
MediaLibraryWidget::formElement in core/modules/media_library/src/Plugin/Field/FieldWidget/MediaLibraryWidget.php
NumberWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/NumberWidget.php
OptionsWidgetBase::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsWidgetBase.php
PathWidget::formElement in core/modules/path/src/Plugin/Field/FieldWidget/PathWidget.php
ShapeOnlyColorEditableWidget::formElement in core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldWidget/ShapeOnlyColorEditableWidget.php
StringTextareaWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/StringTextareaWidget.php
StringTextfieldWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/StringTextfieldWidget.php
TelephoneDefaultWidget::formElement in core/modules/telephone/src/Plugin/Field/FieldWidget/TelephoneDefaultWidget.php
TestFieldWidget::formElement in core/modules/field/tests/modules/field_test/src/Plugin/Field/FieldWidget/TestFieldWidget.php
TestFieldWidgetMultiple::formElement in core/modules/field/tests/modules/field_test/src/Plugin/Field/FieldWidget/TestFieldWidgetMultiple.php
TimestampDatetimeWidget::formElement in core/lib/Drupal/Core/Datetime/Plugin/Field/FieldWidget/TimestampDatetimeWidget.php
UriWidget::formElement in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/UriWidget.php

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