--- /dev/null
+<?php
+
+namespace Drupal\form_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Defines a form for testing form element description display options.
+ *
+ * @see \Drupal\system\Tests\Form\ElementsLabelsTest::testFormDescriptions()
+ */
+class FormTestDescriptionForm extends FormBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'form_test_description_display';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $form['form_textfield_test_description_before'] = [
+ '#type' => 'textfield',
+ '#title' => 'Textfield test for description before element',
+ '#description' => 'Textfield test for description before element',
+ '#description_display' => 'before',
+ ];
+
+ $form['form_textfield_test_description_after'] = [
+ '#type' => 'textfield',
+ '#title' => 'Textfield test for description after element',
+ '#description' => 'Textfield test for description after element',
+ '#description_display' => 'after',
+ ];
+
+ $form['form_textfield_test_description_invisible'] = [
+ '#type' => 'textfield',
+ '#title' => 'Textfield test for visually-hidden description',
+ '#description' => 'Textfield test for visually-hidden description',
+ '#description_display' => 'invisible',
+ ];
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ // The test that uses this form does not submit the form so this is empty.
+ }
+
+}