PUBLIC MARKS with tag Silverback

Moving Sonic the Hedgehog to the right caused the foreground to move past the camera to the left faster than the background, creating a faux-3D view of Green Hill Zone. We can create a similar effect on a web page by fixing semi-transparent background images to different sides of the browser viewport, and at different horizontal percentage positions.

http://ecrirepourleweb.com/non-classe/un-gorille-au-service-de-lutilisabilite