What Does Viewport Mean?
A viewport is a term for the visible area of a webpage on a display device. It is used in both code and analog design as a way to refer to the display screen and how layout fits into that screen.
Techopedia Explains Viewport
Since new devices have radically different screen sizes, the viewport has become a major consideration in responsive design. Engineers have to figure out how to fit webpages into a small viewport for a traditional smartphone or mobile device. Even tablets tend to be smaller than traditional computer screens.
