$xuacompatible = [
    '#tag' => 'script',
    '#attributes' => [
      'type' => 'text/javascript',
    ],
    '#value' => "
var axel = Math.random() + \"\";
var a = axel * 10000000000000;
document.write(
<iframe src=\"https://9648480.fls.doubleclick.net/activityi;src=9648480;type=invmedia;cat=dbm_n0;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=;tfua=;npa=;ord=' + a + '?\" width=\"1\" height=\"1\" frameborder=\"0\" style=\"display:none\">
</iframe>",
  ];

  $variables['page']['#attached']['html_head'][] = [$xuacompatible, 'text/javascript'];