To the main book page.
The Mobile Web Handbook by Peter-Paul Koch. Published by Smashing Magazine GmbH.
I made a mistake in the em/rem in media queries section. 1em = 1rem = initial font size in pixels, where the initial font size is the one defined by the browser. It’s usually 16px, but users can change it in their preferences. In any case the rem unit in media queries has nothing to do with the font-size you define in your CSS. Full tests pending.