3 files changed, 27 insertions, 2 deletions
diff --git a/core/modules/help/src/HelpTopicTwigLoader.php b/core/modules/help/src/HelpTopicTwigLoader.php
index fc2e61bbaaf..9178166597c 100644
--- a/core/modules/help/src/HelpTopicTwigLoader.php
+++ b/core/modules/help/src/HelpTopicTwigLoader.php
@@ -96,7 +96,7 @@ class HelpTopicTwigLoader extends FilesystemLoader {
   /**
    * {@inheritdoc}
    */
-  protected function findTemplate($name, $throw = TRUE) {
+  protected function findTemplate($name, $throw = TRUE): ?string {
     if (!str_ends_with($name, '.html.twig')) {
       if (!$throw) {
         return NULL;
diff --git a/core/modules/help/src/HelpTwigExtension.php b/core/modules/help/src/HelpTwigExtension.php
index e41ad66503d..b8a77a914f6 100644
--- a/core/modules/help/src/HelpTwigExtension.php
+++ b/core/modules/help/src/HelpTwigExtension.php
@@ -41,7 +41,7 @@ class HelpTwigExtension extends AbstractExtension {
   /**
    * {@inheritdoc}
    */
-  public function getFunctions() {
+  public function getFunctions(): array {
     return [
       new TwigFunction('help_route_link', [$this, 'getRouteLink']),
       new TwigFunction('help_topic_link', [$this, 'getTopicLink']),
diff --git a/core/modules/help/src/Hook/HelpThemeHooks.php b/core/modules/help/src/Hook/HelpThemeHooks.php
new file mode 100644
index 00000000000..431c7d089d2
--- /dev/null
+++ b/core/modules/help/src/Hook/HelpThemeHooks.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Drupal\help\Hook;
+
+use Drupal\Core\Hook\Attribute\Hook;
+
+/**
+ * Hook implementations for help.
+ */
+class HelpThemeHooks {
+  /**
+   * @file
+   */
+
+  /**
+   * Implements hook_preprocess_HOOK() for block templates.
+   */
+  #[Hook('preprocess_block')]
+  public function preprocessBlock(&$variables): void {
+    if ($variables['plugin_id'] == 'help_block') {
+      $variables['attributes']['role'] = 'complementary';
+    }
+  }
+
+}