By default, all form are validated on FLEX. To get access to the success or error prompts, you can call the output tag “system_messageâ€. The system message will return either a system failure or a system success message.
Success and error messages are contained in their own spans. Each has a unique class to target the styling. An error message adds a class called ‘error-message’ and conversely, a success message adds a class called ‘success-message’.
{system_message} {% form "login" %} <input class="button" type="submit" value="Login" /> {% endform %}