--- /dev/null
+<?php
+
+/**
+ * @file
+ * Provides System module hook implementations for testing purposes.
+ */
+
+/**
+ * Implements hook_page_attachments_alter().
+ */
+function system_module_test_page_attachments_alter(&$page) {
+ // Remove the HTML5 mobile meta-tags.
+ $meta_tags_to_remove = ['MobileOptimized', 'HandheldFriendly', 'viewport', 'cleartype'];
+ foreach ($page['#attached']['html_head'] as $index => $parts) {
+ if (in_array($parts[1], $meta_tags_to_remove)) {
+ unset($page['#attached']['html_head'][$index]);
+ }
+ }
+
+}