If user clicks on Comment with no text typed, an error message will be displayed. If there is a comment the authentication frame will be activated where use can do all the steps described in the appropriate part.

After successful authorization, the system will try to post a comment. In case of success a new bubble will be added to a page. In other case (e. g. Invalid XHTML), an error message will be displayed.

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Anton: basically works as described. There is one harmless bug though: #551. Partly unit testable (#550).