Hi, On Thu, Aug 28, 2025 at 3:24 PM Matthias Weber <matthiaswebe...@gmail.com> wrote: > > Dear List, > > Using the current version, it is now pretty straightforward to create PDFs > that pass VeraPDF with PDF/UA-2. > > > Canvas (which is commonly used in the US) has an accessibility checker: > > https://community.canvaslms.com/t5/Canvas-Basics-Guide/How-do-I-use-the-Accessibility-Checker-in-the-Rich-Content/ta-p/618238 > > The file tagging-basic.pdf scores 40% accessibility, with three complaints: > > This PDF does not have headings > > This PDF does not have a title > > This PDF contains text with insufficient contrast > > The last item I can fix. A title can be added in Canvas. > > Of course, the document has all the ConTeXt headings, but apparently Canvas > is not able to see them (nor the title). > > On the Canvas page it says about headings: > > • Sequential headings: Heading levels should not be skipped (e.g. H2 to > H4). However, the tool does not check if the first header starts with H2 or > whether the headings are sequential with the rest of the content in the page. > Tables do not begin with H1, which is designated for the page title. > > Is there a way to make the headings visible in the PDF? > > Thanks, > > Matthias > > (I can help with testing and give you access to a Canvas site, if needed)
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 PS "Funnily" enough, you just missed the pdf accessibility talk/discussion at the ConTeXt meeting (as well as the dinner afterwards...) :) ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / 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 ___________________________________________________________________________________
