At least for the Visium vignettes but ideally all vignettes. It's a lot of work since there are so many vignettes. Ideally there should be a way to sonify spatial data or convert to tactile.
Scroll down to find 'Best Practices 2: Images' and 'Best Practices 3: Tables'
Captions are best when you're describing complex images (like diagrams or graphs) because captions can contain a lot more information. Alt text is usually brief.
At least for the Visium vignettes but ideally all vignettes. It's a lot of work since there are so many vignettes. Ideally there should be a way to sonify spatial data or convert to tactile.
Alt text resources:
Captions are best when you're describing complex images (like diagrams or graphs) because captions can contain a lot more information. Alt text is usually brief.