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@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.