I'd still love to make a browser add-on that replaces images with no description with the word image. Since the only code I know how to write is basic AutoHotKey script it's not happening any time soon.
@KaraLG84 So that the screenreader will read out “image” and not the long filename of the image with usually lots of numbers in the end? I.e. change non-existing alt attributes for img tags to alt="image"?
Which browser are you using on which operating system? A GreaseMonkey script should be able to this for Firefox and Chrome (two separate scripts maybe) on Windows, Linux and MacOS, but not on iOS as far as I know. Maybe I would be able to figure it out.
@KaraLG84 Or replace the picture with the image completely so that sighted people will notice they forgot alt texts? This can probably still be done with GreaseMonkey.
@GreenSkyOverMe The latter. Either replace them with image or the file name, which is what gets read out when there's no alt text. The reason why I said image though is that pictures attached to posts on tother place have "image" as alt text if you don't add any yourself.
@GreenSkyOverMe It's twitter. Facebook's a weird one though because it tries to auto generate descriptions but usually fails. So a stunning view of a beach might be rendered as "maybe an image of ocean, sky, nature, water, shorts, beard and text". I've literally seen it put random things like shorts and beard in there.