RE: https://front-end.social/@AlainVagner/116205488526954436
This has come up before. Screen readers do not have a limit. Long-desc is no longer supported. However for much longer alt text, it probably makes more sense to put in an aria-described by pointing to a paragraph or page describing the content.
I don't think that a 1500 character limit is unreasonable. Most folks barely do 20.
But then maybe maybe NASA won't like it https://www.npr.org/2022/07/22/1112878868/webb-telescope-alt-text-visually-impaired