As tablet devices become more and more common, magazines and textbooks undergo transition to electronic media. Unlike trade books that went through similar transformation earlier, these publications are traditionally designed with a lot of attention given to their layout. They are typically produced by high-end publishing systems, such as Adobe InDesign or QuarkXpress using fixed page size. This presents a challenge, since consumers use all sort of devices to read these publications and or best experience, content needs to be adapted to fit in specific device (or browser window) dimensions.
EPUB Adaptive Layout is a CSS-based standard to express these types of layouts for rendering on consumer devices, expressing rich layouts found in today's magazines and textbooks in a manner that allows efficient adaptations to device dimensions and user preferences (such as font face and size). It was developed by IDPF that defines the industry-standard format for ebooks.
To learn how to write Adaptive-Layout-enabled CSS stylesheets, please refer to the spec and tutorial. Tutorial starts with a simple Adaptive Layout stylesheet and adds more and more features on each step. New parts of the stylesheet are highlighted in yellow.