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Does it exist: a standard or convention for image services to return alt text in an HTTP header?
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Lots of very smart folks in the replies here suggested using Exif metadata for this, sounds awesome to me (though maybe more difficult to polyfill?) @nomsternom/1533013102870020096 @ascorbic/1532980129961500674 @ngriffin_uk/1533051498275516416 @SteveALee/1533018056888393735