Some reader apps (epub) will not change the text colour if it is coded to black. I had this with Coolreader, Kobo, and Lumiread on android;Stanza and Bluefire reader on iOS. The epubs came from various sources. I don't know if any of the apps have fixed this or not. It's kind of disconcerting to set your nightmode up to white text on a black screen, and have the app show a completely black page
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