Google Code-in

OAuth extension is a MediaWiki extension which allows users to authorize an application (the consumer) to use the MediaWiki API on their behalf. Its source code is here on Gerrit.

Every authorisation request is validated by a unique request token which once used it cannot be reused. Attempting to request authorization with already used token will yields an error message.

This error messages does not render properly. (See what happens in this image) or follow the reproduction steps outlined on Phabricator to see the error on live wiki.

Your work on this task is to find a way to render the message in a proper way. That's the unparsed HTML to be actually parsed.