Actually, light backgrounds with dark text is damaging for the eyes. White on black is much better and, in general, easier for most people to read. It was actually the way the internet used to be. Dark backgrounds and light text. In fact, even road signs are usually dark blues and greens and reds with white lettering, as they are the easiest for people to read. There are, of course, white signs with black lettering, and people who read better with dark text on light backgrounds... But they are the minority.
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