Hi Steffen The new manuals should help to create PDFs that pass VeraPDF. I have managed to make three large sets of lecture notes ‘accessible’ that are heavy on math and images. I have encountered a few glitches (for instance, with \setuphead using before= and after=). I’ll be happy to give you access to the complete sources if you think this will be helpful.
Canvas uses Ally to check PDFs, and the accessibility score I can get with it is about 50%. Mikael has looked into this, and he wrote earlier on the mailing list: > I am sorry. Canvas uses the Ally checker, and the specification of > what it does and does not is simply not available. In particular, it > does not follow UA-2. (Maybe more something like PDF1.X). The title is > in the file, but not in the place where Ally is expecting it (and > there it is not, as far as I understand, compatible with UA-2...). > > Joseph from the LaTeX team wrote on their forum, see > https://usergroup.ally.ac/s/discussion/post/post/view?id=2362 > > We also have Canvas at our university. I have written to the > accessibility people at our university and explained that the tool > they pay for is not good for the purpose. > > There will be no work from our side to try to satisfy the Ally > checker. It is a black box. > > /Mikael My institution is currently satisfied if I provide them with VeraPDF-certified, UA-2 compliant PDFs… There is another issue with PDFs compiled with \setupbackend[format=pdf/ua-2] \setuptagging [state=start, preset=basic, level=2, option=interaction ] That I have not been able to figure out: All viewers I have tried on my Mac crash when opening large PDFs that are compiled this way, typically when I reach a page that contains a figure. With one exception: Acrobat. I don’t know whether it’s ConTeXt or the readers that struggle with accessible PDFs. It also only happens with larger PDFs (50+ pages, maybe) The viewers work fine when I compile the files without the accessibility preamble. Best, Matthias > On Nov 16, 2025, at 1:11 AM, Pablo Rodriguez via ntg-context > <[email protected]> wrote: > > On 11/15/25 20:52, Steffen Wolfrum wrote: >> Hi Pablo, >> >> Thanks you very much for mentioning these manuals. Great, I didn't know >> they are there, but now I found them. > > Hi Steffen, > > on a second thought, I wonder whether \setupbackend[format=pdf/ua-2] > might give you better results. > > Just in case it might help, > > Pablo > ___________________________________________________________________________________ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : [email protected] / > https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) > archive : https://github.com/contextgarden/context > wiki : https://wiki.contextgarden.net > ___________________________________________________________________________________
___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : [email protected] / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
