Maybe according to the defined behavior of those characters, but that can't be why notepad doesn't support Unix line endings, as it still doesn't actually line

Maybe according to the defined behavior of those characters, but that can't be why notepad doesn't support Unix line endings, as it still doesn't actually line feed when it sees a line feed character. I have never tried but I also suspect it won't do a carriage return for just a carriage return character (to be fair, that wouldn't really makes sense in a text editor anyway).