Re: WD-CSS21-20020802 section 8, "Box model", substantive comments

Etan Wexler wrote:
 >
> "Notably for HTML, user agents may render borders for certain elements
> (e.g., buttons, menus, etc.) differently than for "ordinary" elements."
> 
> Is this a grant of permission or a record of impermissible behavior?  The
> word "may" is ambiguous.

http://www.w3.org/TR/2002/WD-CSS21-20020802/conform.html#q1 :
  | The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
  | "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
  | document are to be interpreted as described in RFC 2119 (see [RFC2119]).
  | However, for readability, these words do not appear in all uppercase
  | letters in this specification.

http://www.ietf.org/rfc/rfc2119.txt :
  |
  |5. MAY   This word, or the adjective "OPTIONAL", mean that an item is
  |   truly optional.  One vendor may choose to include the item because a
  |   particular marketplace requires it or because the vendor feels that
  |   it enhances the product while another vendor may omit the same item.
  |   An implementation which does not include a particular option MUST be
  |   prepared to interoperate with another implementation which does
  |   include the option, though perhaps with reduced functionality. In the
  |   same vein an implementation which does include a particular option
  |   MUST be prepared to interoperate with another implementation which
  |   does not include the option (except, of course, for the feature the
  |   option provides.)