The document provides an overview of responsive web design testing. It discusses how responsive web design works through flexible grids, relative sizing, and media queries. It outlines things to keep in mind when testing such as selecting devices, handling frequent changes, and challenges with emulators. The document then introduces the Galen framework for responsive web design testing. It describes how Galen works by defining devices and layout specs, and opening browsers to specified dimensions to verify specs. Key aspects of the Galen spec language are outlined such as object definition, tagging, positions, alignment, and comparing CSS properties and images. Finally, the document advertises a question and answer period.