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What about aria-label? It has no size limit that I know of? But neither does alt? Hell I have seen data-attributes with 5k long strings in them.
AFAICT aria-describedby is meant to be used when a description for the image is already in an existing node. It is meant to point to h1-h6 tags or a div or p that is meant to be visible to all. That way redundant pieces of text are not created for the accessibility reader.
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