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.
In theory, the width of the element is restricted by the width of the viewport. The element takes 100% of the width of that viewport. The viewport, in turn, is exactly equal to the browser window: itâs been defined as such. The viewport is not an HTML construct, so you cannot influence it by CSS. It just has the width and height of the browser window â on desktop.