Title of this post may seem strange to you but this is true, You can actually save some energy by using this Javascript on your website. Let me tell you how.
This javascript turns the webpage black if there is no user activity on the page for some time. As the page predominantly turn black the script in-effect saves energy.
Image displayed is primarily a function of the user's color settings and desktop graphics, as well as the color and size of open application windows; a given monitor requires more power to display a white (or light) screen than a black (or dark) screen.
Roberson et al, 2002.
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