see:

• http://www.tiddlywiki.org/wiki/TiddlyWeb
•  http://tiddlyweb.peermore.com/

Tickets related to TiddlyWeb in this trac instances usually have a prefix of "[TiddlyWeb]" and a component of "tiddlyweb". In those tickets priority and severity mean their own thing which might be separate from other non-TiddlyWeb tickets (or might be the same, dunno):

• priority: how important is it that this ticket be done soon + how likely is it that this ticket will be addressed soon.
• severity: how badly is the system broken by this issue