code: public function findField($selector)
      {
          $selector = ltrim($selector, '#');
          $element = $this->getWorkingElement();
  
          foreach ($this->findLabels($selector) as $forAttribute => $label) {
              // We trying to find an ID with "-upload" suffix, because some
              // image inputs in Drupal are suffixed by it.
              foreach ([$forAttribute, "$forAttribute-upload"] as $elementID) {
                  $field = $element->findById($elementID);
  
                  if (null !== $field) {
                      return $field;
                  }
              }
          }
  
          return $element->findField($selector);
      }
docs: @param string $selector
  
  @return NodeElement|null