Give media a short text alternative
All media files must have a brief textual introduction, even if full alternatives such as a transcript or audio description are available. Such a short introduction should roughly describe the contents of the media file. With this information, visitors can decide for themselves what they want to do with the media file. This is especially useful to visitors who cannot easily scan the content, such as visitors who use screen readers.
A short textual introduction can be given with a descriptive headline, a descriptive title or possibly a descriptive label.