Font shorthand not validating

I have used the validator for years, but suddenly standard font  
declaration shorthand is not validating, apparently because of the  
slash between the font-size and line-height. Thus this code:

p { font: 11px/14px Arial, Helvetica, sans-serif; }


gives this error:

Value Error : font / is not a font-family value : 11px / 14px  
Arial,Helvetica,sans-serif


But without the slash and the line-height value it validates:

p { font: 11px Arial, Helvetica, sans-serif; }


Even the W3C's own first example here gives the same validation error!

http://www.w3.org/TR/CSS2/fonts.html#font-shorthand

p { font: 12px/14px sans-serif }



Thank you,

--Jay Cornell