External conformance dependency in forms

http://www.w3.org/TR/web-forms-2/#x-www-form-urlencoded

> Authors must not specify an encoding other than UTF-8 or US-ASCII in  
> the accept-charset attribute when the method used is get and the  
> action indicates an HTTP resource.

That conformance requirement is not checkable from the bytes of the  
document plus the content-type header when the action is relative as  
it would depend on the base URI in that case. Hence, the conformance  
status could change depending on whether the author puts the document  
on a server or uploads it to a validator.

This point should probably be given consideration with other external  
conformance dependency issues related to images and such.

-- 
Henri Sivonen
hsivonen@iki.fi
http://hsivonen.iki.fi/