A birdcage (or bird cage) is a cage designed to house birds as pets. Antique (or antique-style) birdcages are often popular as collectors' items or as household decor but most are not suitable for housing live birds, being too small, or of unsafe materials or construction.ood quality cages designed for pet birds are more suitable. Most parrot cages are made or wrought iron and painted with a non-toxic paint referred to as powder-coating. However, the newest trend in the market is cages made of solid stainless steel.
A viewport is a 2D rectangle that defines the size of the rendering surface onto which a 3D scene is projected.
Adapting a websitesâ view size is regulated with CSS and is based on the viewport of the device a visitor is using. The viewport is the visible part of your website, without scroll bars. Annarita wrote an excellent article about the concepts of responsive design here on SitePoint.com. You can read it here.