It works by giving you a new webpage with a frame that matches the resolution of the target device, whether it is the iPad, a TV, Xoom, or what have you. The source website is shown inside the frame.

But it doesn’t show the device specific versions of a site, unfortunately.  For example, most sites have a mobile version for smartphones, small tablets, and the like. Screenfly only pulls the desktop version of a website. Even so, this is still a useful little tool for checking how web content works on the various devices.

via Web Resource Depot

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