WCAG 2.2
media alternative for text
media that presents no more information than is already presented in text (directly or via text alternatives)
Note: A media alternative for text is provided for those who benefit from alternate representations of text. Media alternatives for text may be audio-only, video-only (including sign-language video), or audio-video.
Source: WCAG 2.2 definition of “media alternative for text” (opens in a new tab) (W3C)