There are typos in 15.5 Small-caps: the 'font-variant' property (http://www.w3.org/TR/CSS21/fonts.html#small-caps).
http://lists.w3.org/Archives/Public/www-style/2011Oct/0350.html (Issues 1 and 2)
Specifically, the proposal is:
Section 15.5 (Small-caps: the 'font-variant' property) [http://www.w3.org/TR/CSS21/fonts.html#small-caps] says:
# It is acceptable (but not required) in CSS 2.1 if the
# small-caps font is a created by taking a normal font
# and replacing the lower case letters by scaled
# uppercase characters.
This bug reports seems to be a DUPLICATE of
Bug 14437 - Editorial issues with small-caps
.. and of
Bug 14440 - Editorial tweaks to sentence wrt font-variant