SystemModuleTestHooks.php

<?php

declare (strict_types=1);
namespace Drupal\system_module_test\Hook;

use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for system_module_test.
 */
class SystemModuleTestHooks {
  
  /**
   * Implements hook_page_attachments_alter().
   */
  public function pageAttachmentsAlter(&$page) : void {
    // 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]);
      }
    }
  }

}