Finally, we setup the Viewport, which controls the viewablearea of the browser.
最后，我们设置视图，用于浏览器可视区域的控制。
2
This provides a nice wide viewablearea for the tiles at various stages of the zoom process.
这提供一个不错的宽幕可视区域，用于变焦过程中各种场景中的贴片。
3
The default behavior of Mobile Safari is to assume that the Web site is 980 pixels wide and shrink it by about one-third to fit in the viewablearea of the iPhone.
Mobile Safari 的默认行为将假定 Web 站点的宽度为 980 像素，并且把它收缩三分之一以适应 iPhone 的可视区域。