Panel Component

• Use the panel component to display important information when a transaction has been completed.
• In most cases, the panel component is used on confirmation pages, to tell the user they have successfully completed the transaction of failed with the transaction.
  (GOV.UK Design System (opens in a new tab))

Never use the panel component to highlight important information within body content. (GOV.UK Design System (opens in a new tab))

The panel text is only meant for a high-level explanation of what has happened. Short words and phrases can highlighted information is easy to read at different screen sizes. For example, 'Application complete'.

If you need to give detailed information, or more context, use the description text under the heading text.
(GOV.UK Design System (opens in a new tab))

If the panel doesn't contain an accurate WAI-ARIA role or property, the screen reader software won't recognize the purpose of the message — and neither will the user.
Thus, a ARIA role is needed for the accessibility of panel. role="alert"should be used in this case for important information that needs to be presented to the user immediately. (Bureau of Internet Accessibility (opens in a new tab))