XP.
I think Firefox 3.5 is still widely used, maybe older version too.  For
Windows, I guess IE 7 and 8 are used too.  Opera seems to be compliant,
so a good test; on Mac OS X, I understand other browsers are used.

clear="all">&nbsp;</div>'
> at the end of the header.  I think these should be "both" instead of
"all".
> "all" works, but "both" seems to be more correct.
I’m afraid my Web skills are a bit rusty; I don’t know anymore the
various quirks of various browsers and required kludges.  If you’re
making a patch, you should do the research :)

(name, name)
> On 2011/01/21 18:46:01, merwok wrote:
>> I see no reason for polluting the key value with “.html”

changed
> in 3.3 if it's desirable to do so.

Thinking again about that: The other ?key request you mention have been
added in 3.2, right?  If there is no released version with those
?thing=spam.html request, I repeat my -1 on appending .html.

http://codereview.appspot.com/4090042/