Re: Ruby RB is no error?

 Jens Oliver Meiert (jens@meiert.org) kirjoitti:

> According to

> >
> https://html.spec.whatwg.org/multipage/obsolete.html#non-conforming-features
> > <rb>, <big>, <tt> are obsolete, non-conforming.
> >
> > But I get errors only for <big> and <tt>, not for <rb>.
>
> This is probably due to https://www.w3.org/TR/ruby/, which specifies this
> element.
>

But why would a W3C recommendation that is over 20 years old affect
validation against “living HTML”?