--- /dev/null
+<?php
+
+namespace Drupal\form_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form constructor for testing invalid #type 'range' elements.
+ */
+class FormTestRangeInvalidForm extends FormBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'form_test_range_invalid';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $form['minmax'] = [
+ '#type' => 'range',
+ '#min' => 10,
+ '#max' => 5,
+ '#title' => 'Invalid range',
+ '#description' => 'Minimum greater than maximum.',
+ ];
+ $form['submit'] = [
+ '#type' => 'submit',
+ '#value' => 'Submit',
+ ];
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ }
+
+}