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A viewport is a rectangular viewing region in computer graphics, or a term used for optical components. It has several definitions in different contexts:
- In 3D computer graphics it refers to the 2D rectangle used to project the 3D scene to the position of a virtual camera. A viewport is a region of the screen used to display a portion of the total image to be shown.
- With respect to virtual desktops, the viewport is the visible portion of a 2D area which is larger than the visualization device.
- With respect to web browsers, the viewport is the visible portion of the canvas.
Optical components 
- In Manufacturing it refers to hermetically sealed optical components which are typically used for visual or broad band energy transmission into and out of vacuum systems. Single and multi-layer coatings can be added to viewports to optimize transmission performance. They describe where the selected object portion resides inside a window.
- http://msdn.microsoft.com/en-us/library/ff634571.aspx Microsoft - What Is a Viewport?
- W3C (2011-07-07). "Visual formatting model - 9.1.1 The Viewport". Retrieved 2012-02-14.
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