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Background reading on the document standards PolyDoc implements: what they ask for, where the common misreadings are, and which parts a machine can check for you. These are explainers rather than integration steps. For the API side, see the compliance guides.

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WCAG passes, your PDFs still failAccessibility

Why a clean accessibility audit of your website says nothing about the PDFs it links to, and what PDF/UA asks for that WCAG does not.