Hi Pablo, (resending since my attachments were too large for the mailing list the first time) I did some experiments yesterday, and I was able to produce a file (PDF and source attached) that validates as PDF/UA-2 with veraPDF and that Ulrike Fischer and David Carlisle (who work on the LaTeX accessibility) confirmed was actually accessible. I started from the "lpdf-tag-imp-testing.lmt" file that you posted on the mailing list a while back (I've attached my modified version), and I also had to modify "lpdf-tag.lmt" (also attached). To get the WTPDF tags, I also had to uncomment the "conformance" lines in both lpdf-fmt-imp-ua2.lmt and lpdf-fmt.lmt. Some notes: - I had to manually tag every paragraph with \startparagraph/\stopparagraph, which was annoying. - I had to hardcode mapping all sections to H1 for the validation to pass; this obviously won't work in real documents. There's code that purports to handle this at the end of "lpdf-tag-imp-testing.lmt", but I couldn't get it to work. - "\setupbackend[format=pdf/ua-2]" needs to come before "\setuptagging[state=start]", otherwise lots of stuff will silently break. - I've heard that it's actually usually better to put the TeX source in the Alt text for math instead of the current generated prose, because most people reading math are familiar with TeX anyways. - The file validates successfully, but there are lots of "Nested MCID" warnings. Thanks, -- Max