How come reading white text on a black background burns into my vision, but black text on a white background doesn't?

Like, when I'm reading comments on a website that has dark mode, and the background is black and the text is white, when I go to a different page, my vision has black and white bars burned into it for a couple minutes. But when I read black text on a white background, and then visit a different page, it... show more Like, when I'm reading comments on a website that has dark mode, and the background is black and the text is white, when I go to a different page, my vision has black and white bars burned into it for a couple minutes. But when I read black text on a white background, and then visit a different page, it isn't burned into my vision. Why?
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