The "/tkthistory" page:
Show the complete change history for a single ticket. Or (to put it another way) show a list of artifacts associated with a single ticket.
By default, the artifacts are decoded and formatted. Text fields are formatted as text/plain, since in the general case Fossil does not have knowledge of the encoding. If the "raw" query parameter is present, then the* undecoded and unformatted text of each artifact is displayed.