void HTMLFormElement::addToPastNamesMap(Element* element,
                                        const AtomicString& pastName) {
  if (pastName.isEmpty())
    return;
  if (!m_pastNamesMap)
    m_pastNamesMap = new PastNamesMap;
  m_pastNamesMap->set(pastName, element);
}

Historically, this outdated classification described vulnerabilities from improper handling of data inputs, leading to unexpected program behavior or errors when input validation fails.