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It is for the visually impaired, and most often som sort of inverted theme. You have it in windows, os x, iOS, android and so on. Many websites has this as an alternative as well. It is simple, the more that are able to read the more people can access the site. Not everyone want's to have everything read to them via screen readers, and crappy code most often mutulates that experience as well.
Images has the alt-tag for example, so that people who don't se images can make out the context anyway or people who have disabled image view in their system.
Usability?
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