On 3/20/06, M. Seyon <evoltlist at delime.com> wrote: > However, it seems this existing specification does not explicitly state > that a radio button set must have one button that is checked. Rather, it > says "user agent behaviour... is undefined". It is undefined because it is a misuse of the control. User agents still need to handle this situation SOMEHOW, though, which is why the note is there. This is the case in many instances where web developers misuse markup. User agents tend to want to still be able to display the page as best it can, even if the developer messed up. It doesn't really make sense to have none selected in a radio button set. The options in the set are supposed to represent the universe of options available. -- Matt Warden Miami University Oxford, OH, USA http://mattwarden.com This email proudly and graciously contributes to entropy.