CSS3 Background and Borders, error in example

Hi,
In example XXI of [1] there is this strange line:
box-width: border-box;

box-width is no longer in css3-box (it was in 2002, but no longer in 
2007), plus the value is more one of box-sizing than box-width (thanks 
Bert for the pointer).
Cheers,

[1] http://www.w3.org/TR/2009/CR-css3-background-20091217/#box-decoration-break

-- 
Baroula que barouleras, au tiéu toujou t'entourneras.

         ~~Yves