Re: Section 7.1 or CSS Test Suite puzzled me again

You're right.  At rules can't come directly within declaration-blocks.

At-rules can, however, come in property values.  (This is clearer in
the CSS2 spec [1], but is stated (implicitly) in CSS1:

  "Any character may occur in the value, but parentheses (()), brackets
  ([]), braces ({}), single quotes (') and double quotes (") must come
  in matching pairs. Parentheses, brackets, and braces may be nested.
  Inside the quotes, characters are parsed as a string." [2]

Thus a valid test would be:

P.twentytwo {
  type-display: @threedee {rotation-code: '}';};
  color: green;
  }

David Baron

[1] http://www.w3.org/TR/REC-CSS2/syndata.html
[2] http://www.w3.org/TR/REC-CSS1#forward-compatible-parsing