The para­graph on p20 which reads:

“This syn­tax tests that both expres­sions are matched before apply­ing the selec­ted rules. For example, to make sure all per­muta­tions of widescreen are covered, as men­tioned in the pre­vi­ous sec­tion, you would cre­ate this query:“

Should read

“This syn­tax tests that both expres­sions are matched before apply­ing the selec­ted rules. For example, to test for a small screen in 16:9 widescreen format you could cre­ate this query:“

And the code example should read:

@media only screen and (aspect-ratio: 16/9) and (max-device-width: 800px) { rules }

— 8 June, 2011