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The ltx-talk class can be used to create (on-screen) presentations, outputting tagged (accessible) PDFs. Its syntax is largely similar to beamer's, though not all of beamer's functionalities have been implemented in ltx-talk. Best compiled with LuaLaTeX especially if you want to tag mathematical contents automatically. ltx-talk is currently experimental. See the CTAN package ltx-talk webpage or the Github repository for the latest developments. If you'd like to use the latest version of ltx-talk in your Overleaf project, you can join our Labs program to access a rolling version of TeX Live in your projects.
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