abstract:A viewport is a rectangular viewing region in computer graphics, or a term used for optical components. It has several definitions in different contexts:
All of a sudden, it seemed that there was a conceptually easy way to make a single website look good on multiple screen sizes just worry about the pixel width of the viewport.
The whole practice of responsive web design that has evolved over the past two years as the most expedient way to deal with getting web content to look decent on the ever-proliferating variety of mobile devices is based on the width of the viewport.