The document discusses how to rapidly prototype user interfaces using Bootstrap, a popular front-end framework. It outlines the benefits of prototyping with Bootstrap over traditional wireframing or jumping straight to development. Prototyping with Bootstrap allows building interactive prototypes quickly in hours using responsive design principles. The prototypes can then be used as the basis for the final site design rather than being discarded. The document introduces key concepts like responsive design, prototyping, and frameworks. It also provides an overview of features in Bootstrap like grids, components, and how they can be combined for prototyping.
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