Benjamin Mako Hill
95a368afc6
Beamer cannot produce a genuinely tagged PDF. The master template validates as PDF/UA-2 only because tagpdf marks everything it was not told about as decorative, so a screen reader gets the frame titles and nothing else. Beamer 3.77 then made matters worse by refusing \DocumentMetadata outright, which breaks tagging on TeX Live 2025 and leaves the deck failing validation altogether. ltx-talk was written by the LaTeX Project with tagging as a design goal. The slides built here carry real paragraphs, lists as L/LI/Lbl/LBody, sections as headings, formulas as MathML, and alt text that reaches the PDF. veraPDF passes on the strength of that structure rather than in spite of its absence. The metropolis theme files go with beamer; trantor replaces them. Fonts, figures and the purple palette are unchanged. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>