docs: private void checkCloseTagChildren(HtmlCloseTagNode closeTag) {
      HtmlAttributeNode phNameAttribute =
          closeTag.getDirectAttributeNamed(MessagePlaceholders.PHNAME_ATTR);
      HtmlAttributeNode phExAttribute =
          closeTag.getDirectAttributeNamed(MessagePlaceholders.PHEX_ATTR);
      // the child at index 0 is the tag name
      for (int i = 1; i < closeTag.numChildren(); i++) {
        StandaloneNode child = closeTag.getChild(i);
        if (child == phNameAttribute || child == phExAttribute) {
          continue; // the phname and phex attributes are validated later and allowed in close nodes
        }
        errorReporter.report(child.getSourceLocation(), UNEXPECTED_CLOSE_TAG_CONTENT);
      }
    }