Slider with Sliding Backgrounds

Among the many super nice design features of the Yahoo! Weather app for iOS is the transition between city screens. The background image doesn't just move away as the screen moves from one screen to the next, the background image itself slides. It appears to be hiding some of the "old" screen and revealing more of the "new" screen those closer you have it to being in full view.

Let's try and pull it off on the web.

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Slider with Sliding Backgrounds is a post from CSS-Tricks