Issue #3530304: Views exposed forms should use SEARCH html element or aria role = search

Closes #3530304

core/modules/search/src/Form/SearchBlockForm.php

@@ -98,6 +98,7 @@ public function buildForm(array $form, FormStateInterface $form_state, $entity_i
     $route = 'search.view_' . $entity_id;
     $form['#action'] = Url::fromRoute($route)->toString();
     $form['#method'] = 'get';
+    $form['#attributes']['role'] = 'search';
 
     $form['keys'] = [
       '#type' => 'search',