One potential action which would be consistent if not very helpful would be to
do nothing. If this were the case, then authors would presumably quickly stop
putting form elements outside of a FORM. From the point of view of the browser,
the HTML would at least contain no surprises.
The only other possibility that I can see is to do as you suggest and issue a
GET using the document URL. For an ordinary HTML document, I expect this would
be just as useless as doing nothing, but when the document is the output of a
CGI script, it might even be useful.
Relay Technology, Inc.