void Document::setDesignMode(const String& value)
{
    bool newValue = m_designMode;
    if (equalIgnoringCase(value, "on"))
        newValue = true;
    else if (equalIgnoringCase(value, "off"))
        newValue = false;
    if (newValue == m_designMode)
        return;
    m_designMode = newValue;
    setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::DesignMode));
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.