Drag and select the area you want to crop, and it'll automatically tell you the pixel dimensions of the selection.

拖拽并选择你想要裁剪的区域，它就会自动告诉你选择的像素维数。

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This is to maintain pixel-for-pixel compatibility - the plug-in display has the same pixel dimensions as the iPhone display, but the iPhone has a much greater pixel density.

这是为了维护像素到像素(pixel - for - pixel)兼容性—插件显示界面与iPhone显示界面的像素尺寸相同，但是iPhone拥有的像素密度更大。

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By being able to toggle a web composition on or off, web developers and designers can have a visual guide for pixel-perfect accuracy of the position and dimensions of web page components.

借由切换网页组成的开关，网页开发者与设计师拥有可视化指导，精确位置和网页部件的尺寸。

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