Responsive Website Design
Parallax scrolling is a web design technique in which the website background moves at a slower pace than the foreground. This results in a 3D effect as visitors scroll down the site, adding a sense of depth and creating a more immersive browsing experience.
Parallax is based on optical illusion. Since the human eye perceives objects that are close to us as larger than things farther away, we perceive distant objects as if they were moving more slowly.
The illusion has been long adopted into parallax across different mediums, fostering a realistic effect.
With advancements in CSS and HTML, parallax effects later evolved into the world of web design as we know it today.
Its first use was in traditional animation, dating back to as early as Disney’s Snow White and the Seven Dwarfs, and in video games such as Super Mario.
Some display systems support multiple background layers that can be scrolled independently in horizontal and vertical directions and composited on one another, simulating a multiplane camera.
Programmers may also make pseudo-layers of sprites—individually controllable moving objects drawn by hardware on top of or behind the layers, if they are available on the display system.
Scrolling displays built up of individual tiles can be made to float over a repeating background layer by animating the individual tiles in order to portray the parallax effect.
In raster graphics, the lines of pixels in an image are typically composited and refreshed in top-to-bottom order with a slight delay between drawing one line and drawing the next line.
