/**
  * Convert insert tags inside "src" attributes to file paths.
  *
  * @param string $data The markup string.
  *
  * @return string The markup with insert tags converted to file paths
  */
 public static function insertTagToSrc($data)
 {
     if (self::isStringUtilAvailable()) {
         return StringUtil::insertTagToSrc($data);
     }
     return \Contao\String::insertTagToSrc($data);
 }