--- /dev/null
+<?php
+
+namespace Drupal\menu_test\Plugin\Derivative;
+
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+
+/**
+ * Test derivative to check local action title escaping.
+ *
+ * @see \Drupal\system\Tests\Menu\LocalActionTest
+ */
+class LocalActionTest extends DeriverBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDerivativeDefinitions($base_plugin_definition) {
+ $this->derivatives['example'] = $base_plugin_definition + [
+ 'title' => "<script>alert('Welcome to the derived jungle!')</script>",
+ ];
+
+ return $this->derivatives;
+ }
+
+}