We have a tool that flags images that lack an alt= attribute. See https://help.siteimprove.com/support/solutions/articles/80000863904-accessibility-image-alt-text-best-practices -- these are essential for conveying the image contents to users on screen readers.
You can add these to your vignettes by using the recent-ish fig.alt chunk option in knitr; see https://www.rstudio.com/blog/knitr-fig-alt/.
Unfortunately the lines are flagged in the HTML output, which won't correspond exactly to the .Rmd file lines, but I assume if you're familiar with the vignette it will be clear which images need it:
tibble/inst/doc/formats.html:2347
We have a tool that flags images that lack an
alt=attribute. See https://help.siteimprove.com/support/solutions/articles/80000863904-accessibility-image-alt-text-best-practices -- these are essential for conveying the image contents to users on screen readers.You can add these to your vignettes by using the recent-ish
fig.altchunk option inknitr; see https://www.rstudio.com/blog/knitr-fig-alt/.Unfortunately the lines are flagged in the HTML output, which won't correspond exactly to the .Rmd file lines, but I assume if you're familiar with the vignette it will be clear which images need it: