I always engage in things like this with some trepidation, partly because of trust issues. I can’t help asking myself if the author really knows all the ins and outs of this (even though it be Kevin Yank himself!)
It depends on context whether you need the div selector in div.class, but at the same time, the semi-colon at the end of the final declaration is optional. Hmmm. So what to choose? And then, does the author know that the quotes around multi-word font names are optional?
Anyhow, great fun. I was a bit slow, though, and panicked a bit at the end as time ran out (I hate time limits!). Got 80% on CSS the first time around, but pretty sure I know what I got wrong. 