The "/tkthistory" page:

URL: /tkthistory?name=TICKETUUID

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.