Captions
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A media caption, also known as AltText or simply alt, is a textual representation of the content of a media file attached to a Fediverse post. Most Fediverse software has a caption feature, so you don't have to describe the media in the post body, but in a separate text field. The text can then be read out loud by screen readers, instead of just noting, that there is a media file, and it can be seen when hovering over the file.