PeachPDF
PeachPDF.PdfGenerateConfig
PdfGenerateConfig.EnableTaggedPdf Property
When set to true, PeachPDF emits a PDF/UA-style tagged structure tree
(StructTreeRoot, MarkInfo, per-element structure elements and marked content)
alongside the visual content, mapping the HTML element tree to standard PDF structure
types (see the -peachpdf-pdf-tag-type CSS property for how the mapping is
controlled). Defaults to false — tagging adds a real amount of extra
object-model bookkeeping per page, so it is an explicit, informed opt-in.
public bool EnableTaggedPdf { get; set; }